Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service

Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service Piotr Kaczmarzyk, Łukasz Warguła, Paweł Janik, Piotr Krawiec, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3821970/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 11 May, 2024 Read the published version in Scientific Reports → Version 1 posted 10 You are reading this latest preprint version Abstract Positive pressure ventilators used by 97.7% of officers of the National Fire Service in Poland, are characterized by work that is not in line with the expectations of the firefighters. In order to improve the technical and operational features of these devices, a survey was conducted among 25,000 eligible firefighters, identifying the application of these devices, problems in use and expected development directions. A total of 682 officers voluntarily completed the survey. Based on their findings, it was determined that ventilators are most often used to smoke out buildings after or during a fire. Mentioned problems when using these devices were mainly noise (78.2%), exhaust emissions (68.5%), and impediments to mobility through the device’s relatively heavy weight (40.2%). Other inconveniences were mentioned by less than 20% of firefighters. Polish firefighters expect the development of these devices mainly in terms of the above-mentioned features (noise reduction (81.7%) and reduction of the weight and size of the ventilators (about 50%)). Other expectations relate to the improvement of smoke removal in buildings: increasing the efficiency of smoke removal (46.4%) and efficiency regarding the rate of smoke removal in a building by increasing the size of the incoming airflow from the building’s surroundings (33.2%). About 15% of firefighters expect changes in the operation of the ventilator itself, that is, an increase in the effective operating time (electric ventilators) and an increase in the device’s uptime. The article also presents suggestions for device development based on the available state of the art. Biological sciences/Ecology/Fire ecology Physical sciences/Engineering/Civil engineering noise exhaust emissions occupational safety firefighter building smoke ventilation positive pressure ventilation (ppv) fire protection units survey Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Introduction The activities of the officers of fire protection units are often associated with exposure to various hazards 1–3 . Such risks include exposure to high temperatures 4–6 , smoke emissions (toxic decomposition products) 7–9 and exposure to strong chemicals 10–12 . In recent years, more and more attention has been paid to aspects of work ergonomics 13,14 and the physical 15 and mental health of firefighters 16 . As reported in a statistical study presented by the National Fire Protection Association (NFPA) in 2017, 38% of firefighter deaths in the U.S. were due to cardiovascular problems, 38% to internal injuries, and 15% were related to involvement in an accident 17 . In order to improve the safety and working conditions of firefighters, in addition to statistical studies of accidents, surveys are also carried out to take into account tips to improve work, by the rescuers themselves. Such research can include studies on firefighter ergonomics conducted by Dąbrowska and Bartowiak in 2019 18 . The research team presented information on identifying the needs of firefighters in relation to smart protective clothing with a hazard signalling system in surveys. In the survey, respondents showed many important features that this type of clothing should have, including a cooling system, location sensor, thermal imaging camera, and chemical concentration sensor. In addition, the firefighters identified several features related to the ergonomics of this type of clothing, including weight, freedom of movement and durability of the materials. Such research is the basis for determining the direction of development of firefighters’ clothing, e.g., like the aforementioned cooling system 19,20 , location sensor 21–23 , thermal imaging camera 24,25 , chemical concentration sensor 26,27 , weight reduction 28 , improvement of freedom of movement 29 and material durability 30,31 . Survey tests were also conducted by Roldan-Gomez et. al. in 2021 32 on the quality of using firefighters’ equipment. The team studied the tools used in prevention, extinguishment and observation activities in forest areas. In their publication, the authors presented the main problems that accompany rescue operations, such as the lack of human and material resources, lack of sufficient real-time information on the course and development of a fire. Due to the nature of the firefighter’s work, i.e. working in an extreme fire environment (often under time pressure), in order to minimize the risks they experience they should have the right tools with a high level of reliability. Equipment used to carry out rescue operations is subject to additional testing and certification before it is approved for use. In Poland and other countries, admittance for use of products is determined by the results of laboratory tests, which are carried out for the purpose of carrying out the process of certification and admittance of such products 33 . Unfortunately, not all devices are subject to the admittance process. In case of positive pressure ventilators, no research methods have been implemented to comprehensively evaluate the effectiveness of these devices 34–36 . Ventilators are characterized by a wide spectrum of operation. According to Kaczmarzyk et al. in 2022 34 , these devices can be used for, among other things: positive pressure (Fig. 1 .) and under pressure ventilation (PPV), positive pressure attack (PPA), assisting evacuation from a fire-affected facility, suppressing fires of free-standing structures, etc. 37 . Taking into account the important role of rescue ventilators in the implementation of rescue operations, CNBOP-PIB (Scientific and Research Centre for Fire Protection – National Research Institute) in Józefów, Poland, has begun to implement the construction of a research infrastructure allowing the evaluation of the most important features determining the effectiveness of this type of equipment. Among the most important characteristics that can determine the effectiveness of rescue operations are: the size of the generated jet; the area of jet dispersion as a function of distance; noise; the length of operating time, as well as the weight and dimensions of the device 38 . The developed range of the apparatus is a flow tunnel made in accordance with the requirements of ANSI/AMCA 240 − 22 and PN-EN ISO 5801 39,40 . Referring to the importance of the problem related to the design and construction of test apparatus dedicated to the comprehensive conformity assessment processes of all ventilators used in rescue operations, it was also decided to ask firefighters themselves about the aspects of using these devices. As part of this project, it was decided to conduct a survey of officers of the National Fire Service (PSP) in order to most accurately tailor the research program of positive pressure ventilators and specifically address those features that need improvement according to the declarations of direct users – rescue firefighters. The survey were formulated to learn about the frequency of using this type of equipment, to learn about the specifics of using positive pressure ventilators, to identify difficulties and weaknesses related to commissioning and use; and to inquire about technical issues of the ventilators that firefighters believe may need improvement and refinement. The purpose of the article is to identify operational difficulties and design flaws in emergency ventilators based on the opinions of their users. In addition, the circumstances and frequency of using these devices were determined, along with obtaining information on expected developments. The survey was performed on the basis of questionnaires conducted among professional rescue firefighters directly involved in rescue operations in Poland. Ethical issues The obtained survey results were checked and approved by the Ethics Committee of the Scientific and Research Center for Fire Protection - National Research Institute. The research was conducted taking into account approved guidelines. The consent to conduct the study was given by the Chief Commander of the State Fire Service in Poland. Additionally, each respondent was informed that participation in the study was voluntary. Each respondent who took part in the survey gave informed consent and accepted the terms of participation. Material and methods Aerial surveys were conducted with professional emergency firefighters directly involved in rescue operations employed by the State Fire Service in Poland. The questionnaire form (using the “Google” protocol) was distributed through 16 Provincial Headquarters of the State Fire Service (location: Białystok, Gdańsk, Gorzów Wielkopolski, Katowice, Kielce, Lublin, Łódź, Olsztyn, Opole, Poznań, Rzeszów, Szczecin, Toruń, Wrocław, Warsaw), to 496 subordinate rescue and firefighting units, located throughout the country. The survey was conducted in a voluntary form, so of the 25,000 eligible to participate, 682 officers completed it. The survey was conducted between July 2022 and March 2023 (Fig. 2 ). The survey contained 5 questions. 4 of the questions were closed-ended, but they also had the option to expand the topic, introduce additional description and expand the answer to the issue the question addressed. Question 5, on the other hand, was strictly open-ended. For the first question only, respondents had a choice of one answer. In other questions, firefighters had the opportunity to select multiple answers. The first question ( 1 ) addressed the issue of using mobile ventilators “Do you use mobile ventilators during rescue operations or cyclic exercises?”. The indicated question was in a way identifying the respondent. The respondent had the option to answer the question in two ways, i.e. yes or no. If the answer was affirmative to the question, the respondent moved on to the next question in the survey. On the other hand, if he or she denied it and selected the answer ‘no’, at this stage this resulted in terminating participation in the survey. The second question ( 2 ) was related to identifying the activities for which firefighters use positive pressure ventilators. The question was “What activities do you use the positive pressure ventilator for?”. In the area of closed questions, the respondent had a choice of 6 answers, labelled a to f respectively, which were: Removal of thermal decomposition products and accumulated heat in the building space (technique: positive pressure ventilation); Removal of thermal decomposition products and accumulated heat in the building space (technique: vacuum ventilation); Smoke removal from the building space after the location of a fire (smoke extraction); PPA positive pressure attack (combination of extinguishing action and mechanical ventilation with mechanical positive pressure ventilation); Action on fires in free-standing structures (e.g. cars, waste containers); Providing air to areas where people may be present and oxygen concentrations may be reduced. For the indicated question, respondents were also given the opportunity to include an additional open-ended comment, where they could indicate additional activities for which positive pressure ventilators are used. The next question ( 3 ) in the survey concerned the difficulties associated with the use of positive pressure ventilators. Respondents read the question “What difficulties did you encounter during the activities of making and using a positive pressure ventilator?” As part of the closed answers assigned to the indicated question, firefighters were given the opportunity to select 15 answers (letter designation ‘a’ to ‘o’), which related to the following operational problems: Insufficient efficiency of the incoming airflow generated by the ventilator; Ventilator operating time; Too large a unit; Impaired mobility of the unit (e.g. too much weight); Presence of defects related to ventilator mechanisms (e.g. changes in the discharge angle); Malfunctions in the drive system; Defects in ventilator components related to poor workmanship; No markings indicating the optimal position of the unit; Problems with the power supply; Noise; Exhaust gas emissions (for ventilators driven by an internal combustion engine); Inability to provide a proper inlet or inlet opening; Inability to provide an effective gas exchange path (supply-exhaust distance); Problems with the correct positioning in terms of distance and angle of discharge in front of the inlet or outlet opening; Adverse environmental conditions affecting rescue operations (e.g. strong wind). For this question ( 3 ), firefighters were also given the opportunity to include an additional response within an open-ended description, where they could indicate difficulties and problems associated with the operation of positive pressure ventilators other than those listed. Question four ( 4 ) of the survey was aimed at identifying the weaknesses of positive pressure ventilators and identifying directions for improvement of the equipment. The question was as follows: “What are your expectations for improving the technical and performance characteristics of positive pressure ventilators? Which features should be modified?”. In this case, respondents were able to mark up to seven responses at a time, indicated by the letters ‘a’ to ‘g’. The closed-form answers were as follows: Increasing in the inflow volume of the airflow generated by the mobile ventilator (capacity); Extending of the effective operating time of the mobile ventilator; Reducing the size of the ventilator; Reducing the weight of the unit; Reliability (failure-free); Reducing noise levels; Increasing the efficiency of flue gas extraction. In this case, respondents also had the option to include an additional open-ended response. The last question ( 5 ) included in the survey was typically open-ended and its purpose was to identify additional insights related to the operation of positive pressure ventilators not previously asked about in the survey. The question was: “What are your other observations that you would like to share regarding the technical and operational performance of positive pressure ventilators?”. As part of this question, respondents were given the opportunity to formulate any observation about the equipment and to point out various problems related to its operation. Results and discussion Analysing the answers to the first question on using mobile ventilators during rescue operations or cyclic exercises, out of all the respondents (682 firefighters), 666 replied in the affirmative, i.e. 97.7% of the respondents (Fig. 3 ). In contrast, a negative response was indicated by 2.3% of respondents (16 people). According to Lambert and Merci, PPV has been widely used among Belgian firefighters for more than 20 years 41 . The use of PPV significantly improves the safety of firefighters and rescued persons hence it is widely used as clearly confirmed by the scientific community 42–44 . Referring to the results of the second question related to the identification of activities in which positive pressure ventilators are used, respondents emphatically showed that the most common activity is the removal of smoke from a building space after a fire has been extinguished (92.2% of respondents). As the second most frequently mentioned activity, firefighters indicated the implementation of smoke extraction during internal fires using positive pressure ventilation (72.4% of respondents). Responses related to smoke extraction are the most anticipated, as a large group of researchers also raise the issue for this purpose 45–47 . The least popular answer among respondents was ‘e’, i.e. Actions related to fires of detached structures (7.5%) (Fig. 4 ). The issue of extinguishing, for example, cars 48 using PPV is a little recognised scientific topic and may also be little publicised among professional firefighters. As part of their open-ended response to this question, firefighters listed situations in which they use PPV: supplying air for faster burning of hydrophobic material; generation of positive pressure in passageways to ensure evacuation conditions; supplying more air to a fire in order to burn it out more quickly (e.g. haystacks); cooling of objects heated by high temperatures; ventilation of the facility after a gas leak using an explosion-proof ventilator to reduce its concentration; removing carbon monoxide from dwellings; routing of fire gases. The information obtained from the open-ended responses is often a new or non-classical approach in the application of PPV during rescue and firefighting operations. Using PPV to post-combust hydrophobic material is not an encountered approach in the literature and requires research into the justification of this method. However, the issue of using hydrophobic materials in extinguishing processes is a current scientific topic, e.g. hydrophobic coatings in dry water methods 49 , extinguishing gel 50 , hydrophobic silica nanoparticles as additives to improve extinguishing agents 51 . Methods of controlled afterburning of ignitable material are justified and, as Kerber and Walton in 2005 point out, PPV can contribute to an increase in the rate of combustion 52 . The delivery of an air jet can facilitate the combustion of compacted materials 53–55 . The routing of exhaust gases and the cleaning of passageways using PPVs are extinguishing methods known and described, for example, by Alianto et al., 2022 56 . In contrast, the cooling of objects heated by high temperatures is described by Madrzykowski and Kerber in 2008 57 and Giełżecki and Wolański in 2014 of the protective clothing of firefighters 58 . In question three, respondents answered a question about the type of difficulties encountered during the activities of setting up and using the ventilators. Firefighters demonstrated a number of problems (Fig. 5 ). The biggest problem identified by respondents is the accompanying noise (78.2%) and emissions of harmful exhaust gases, with equipment powered by combustion engines (68.5%) and difficulties in the mobility of the units, e.g. high weight (40.2%). Other inconveniences with using ventilators are indicated by between 21.9% and 5% of firefighters. Analysing the identified problems, future research should be carried out into what is the main source of noise: the operation of the combustion engine or the ventilator impeller. Development work is being carried out in both groups of noise sources. Noise-reducing rotor and stator geometries are being developed among ventilator designs 59,60 . On the other hand, in the midst of internal combustion engines, vibration and noise reduction is attempted by improving the combustion of the fuel-air mixture 61,62 , the design of mechanisms such as injection valves 63 or improving the damping of exhaust systems 64 . In the small-engine non-road designs used to drive rescue ventilators, the exhaust systems (which also dampen noise) through the compact design are quite small 65,66 . One way to reduce the negative impacts (noise 67 , emissions of harmful exhaust gases 35,68,69 , high temperatures 65,66 ) of internal combustion engines is to replace them with electric motors 70,71 . However, within the group of emergency ventilator drive units, as demonstrated by Warguła and Kaczmarzyk in 2022 36 on the Polish market the most popular are combustion powered ventilators with a power output ranging from 3.4 kW to 6.3 kW (approximately 50% of the market). On the other hand, electric ventilators are commonly offered in the smaller power range from 1.1 kW to 2.2 kW (74% of the electric ventilator market in Poland) 36 . Hence, for the time being, replacing internal combustion drives with electric drives, especially of greater power, seems difficult to implement in practice. The impediments to mobility when using these units, resulting from the high weight, can be reduced by using lighter construction materials for frames 72,73 , ventilator impellers 74 and motors 75,76 . Such materials are known, but the current problem is to produce ventilator parts from lightweight materials at a competitive price. Problems in using emergency ventilators exhibited by a group of about 10 to 20% of users include problems with the correct positioning of the unit: lack of markings indicating the optimal positioning of the unit, problems with the correct positioning in terms of distance and angle of the discharge in front of the inlet or outlet opening. Some manufacturers introduce markings attached to the ventilators to aid their correct positioning (Fig. 6 ). Measurement systems to aid their positioning could be one way forward, but there are none at present. Another perceived problem is the inadequate inflow capacity of the airflow generated by the ventilator, which can be improved by using more powerful drive units. At the same time, increasing the efficiency of the drive units can solve another problem: the unit is too large. Another group of problems relates to architectural considerations related to the inability to provide a proper inlet and intake opening, or the inability to provide an effective gas exchange path (supply-exhaust distance). Currently, this problem is in the minds of architects and they are taking such problems into account. For many structures, analyses of smoke movement are carried out in a computational fluid dynamics (CFD) environment 77–79 to determine the precise geometry of buildings or tunnels, for example. The last problem mentioned in this group was adverse environmental conditions affecting rescue operations (e.g. strong winds). Wegrzynski and Krajewski in 2017 showed that wind force and the location of smoke extraction ventilators (roof or wall-mounted) significantly affect the smoke extraction capacity of buildings (up to 37%) 80 . Research is being conducted into the correlation of wind force and direction on a building’s smoke 81 or fire spreading capacity 82 that seeks to improve firefighting methods. However, there are no clear guidelines for the positioning of rescue ventilators in such a situation. The problems perceived by a group of less than 10% of firefighters using ventilators are those related to the ventilator drive unit, i.e. its faults and operating time. According to the survey, the drive units used in the ventilators are of relatively high quality, with only 7.4 per cent of respondents reporting problems, although it is possible that some of them are using equipment that has been in operation for a long time and may have malfunctions due to wear. With regard to operating time, internal combustion engines are characterised by the absence of operating time limitations when refuelling, whereas battery-driven ventilators in this situation require the replacement of batteries or batteries with increased energy capacity. 9.5% of respondents perceive problems with mechanisms, e.g. changing the angle of the ventilators, and 6.3% other faults related to the poor quality of manufacture of these devices. The solution to this problem may lie in control tests that determine whether products are approved for use by the fire service. Additional problems reported by respondents include the injection of combustion products generated by the ventilators’ combustion engine into the smoke-filled building (they are sucked up by the jet and injected into the building). These gases are also detected by carbon monoxide detectors, distorting the reading. The solution to this problem lies in systems that extract the exhaust gases outside the ventilator’s air intake area (Fig. 7 ). In addition to exhaust emissions, a perceived problem is the vibration of the diesel-powered device, which can result in a change in its position, relative to the initial setting. This problem was studied and analysed by Wieczorek et al. in 2023 44 indicating values for the selection of vibration dampers and vibration isolators that can prevent the equipment from affecting the ground or the operators. Another problem relates to the positioning in the fire vehicle, where it is, according to respondents, positioned too high. This is an individual problem for manufacturers of firefighting vehicle equipment bodies, but this information can be a new design guideline, as the main emphasis in the design methodology to date has been on the position of the vehicle’s centre of gravity 83 . Question four focused on firefighters’ expectations and indicated the expected developments for mobile ventilators based on user feedback. The largest percentage of users, 81.7%, expect a reduction in noise levels and up to 53.5–48.3% expect a reduction in weight and size. This is the most popular expectation among firefighters, and it is noticeable that these are issues that directly affect them when transporting the equipment or operating it. The next comments relate to improvements in the extraction capacity of smoke from buildings: 46.4 per cent of respondents expect to increase the efficiency of smoke extraction and 33.2 per cent expect to improve the building’s air purification capacity by increasing the size of the incoming airflow from around the building. Between 14.3 and 15.5% of respondents expect an increase in the effective operating time of the mobile ventilator and an increase in the device’s reliability (Fig. 8 ). Additional expectations and desired improvements reported by respondents include, for example, increasing the range of possibilities for setting the angle of the ventilator impeller (also introducing control of the direction of the airstream below the horizontal axis). Currently, in the commonly used units, the value for changing the position of the ventilator impeller from the horizontal is between 0° and 18° (upward airflow direction), with the most common four recommended positions 84 . The remaining open-ended responses related to drive units, reducing CO emissions from internal combustion engines and reducing the cost of purchasing electric-powered ventilators with increased uptake. The last question was open-ended and concerned proposals for improving the technical and performance characteristics of mobile ventilators. Only those not mentioned directly or indirectly in the earlier questions were analysed. The development or dissemination of dedicated extractor ventilators is expected. Such a solution could be useful for smoke extraction in confined spaces where the positive pressure method is not effectively applicable (e.g. basements without windows). With regard to this aspect, aeration sleeves are a helpful tool. With this solution, it is possible to supply air to any area of the room to be ventilated and the inlet opening (e.g. a door) can be used as an exhaust point. An important feature advocated by respondents is the design of ventilator housings to facilitate cleaning. Such structures are contaminated with soot and oily carbon build-up especially on the blades and rotor housing and cowl after smoke removal. Currently, most commercial designs are characterised by the time-consuming and complicated removal of the rotor housing, which makes maintenance of the unit difficult. At the same time, problems are reported with the installation of the light foam net or the compatibility of the aeration sleeves. Firefighters expect the aeration sleeves to be standardised, as they see problems connecting them and connecting them to ventilators if they are made by different manufacturers. Ventilator operators also expect wheels to aid their mobility, as not all units are equipped with them, and wheel chocks for units with significant vibration. Limitations on the use of positive pressure ventilation due to the extinguishing of the internal combustion engine due to a deficit of oxygen in the fuel-air mixture. The advantages and disadvantages of electric and combustion fan drives are recognized, hence there are proposals for electric-fuel hybrid drives. We can conclude that the authors have in mind a kind of parallel hybrid, but a solution where two sources of propulsion would work simultaneously would not eliminate most of the disadvantages. Thus, it can be concluded that the authors of the answer are referring to a fan with two independent drives, used depending on demand and operating conditions, for example, in an open space with a combustion drive, and in a closed space with an electric drive. A similar increase in the universality of the fan can be achieved by a hybrid series drive, which would rely mainly on a fan with an electric motor powered by a generator through electric wires from a greater distance, the solution eliminates one of the major drawbacks of electric fans, namely the battery (the main disadvantages cited: limitation in energy storage capacity, durability, purchase cost). In addition to design expectations, firefighters report a need for more training in the area of using ventilators during rescue operations, especially with regard to operations during a fire. Firefighters also expect inspections of the equipment admitted for use, as there are known cases of new equipment being purchased with very low efficiency, and thus ineffective in rescue operations. The number of ventilators per unit in a particular province is also expected to increase. Conclusion One of the ways to identify directions for the development of mobile ventilators, in terms of improving their use, are surveys of firefighters who actively use these devices during rescue and firefighting operations. Firefighters in Poland use these devices 92.2% of the time to ventilate buildings after a fire is extinguished or during a fire (72.4%). One of the non-classical uses of these devices is to supply more air to a fire in order to burn it out faster (e.g. haystacks). Difficulties cited during the use of these devices were mainly: noise (78.2%), exhaust emissions (68.5%), and difficulties in mobility through the relatively heavy weight of the device (40.2%). Other inconveniences were mentioned by less than 20% of firefighters. Polish firefighters expect the development of these devices in terms of direct impacts on their bodies, namely reducing noise (81.7%) and decreasing the weight and size of fans (about 50%), which require manual transport. Other expectations include improvements in building smoke removal: increasing the efficiency of smoke removal (46.4%) and the efficiency of building air purification by increasing the volume of incoming airflow from the building’s surroundings (33.2%). About 15% of firefighters expect changes in the operation of the ventilator itself, that is, an increase in the effective operating time (electric fans) and an increase in the unit’s uptime. Among the firefighters’ comments in terms of improving technical and operational performance, not mentioned earlier, they expect: efficient and commercially available exhaust ventilator designs dedicated to smoke removal in confined spaces, ventilator housing designs that facilitate cleaning, easy-to-install and inter-manufacturer-compatible accessories such as aeration sleeves or foam systems, and wheeled transport support systems. In addition to the design expectations of firefighters, they report the need for more training in the area of ventilator use during rescue operations, especially taking into account actions during a fire. Firefighters also expect to inspect the equipment admitted for use, as there are known cases of new equipment being purchased with very low efficiency, and thus ineffective in rescue operations. In the existing literature, there is no analysis of expectations in the development direction of mobile ventilators, which studies have shown should continue to be developed structurally and their users trained in their use. A limitation of the research is the problem of using mobile ventilators by professional firefighters in the territory of only one of the European Union countries. These problems can vary significantly in more or less developed countries. Further research should be conducted on design changes to these units, e.g. less impactful drive units, more efficient air jet generators, more ergonomic frames during transport. In addition, there should be increased investment in training firefighters in the skills to use these devices during rescue operations. Declarations Availability of Data and Materials The datasets generated and analysed during the current study are available in the Google Cloud repository: https://drive.google.com/drive/folders/1Qhhm8iD36sE9GLYU2hJhGBzzPot6ZhSP?usp=sharing Funding The research presented in the article was carried out as part of the Ministry of Education and Science program’s “Implementation Doctorate” executed in 2020–2024 (agreement no. DWD/4/22/2020). Institutional Review Board Statement Not applicable. Informed Consent Statement Not applicable. Data Availability Statement Not applicable. Conflicts of Interest The authors declare no conflict of interest. References Maloney, S. R. et al. Perceived Health Risks Among Firefighters; The New Jersey Firefighter Health Survey. J. Occup. Environ. Med. 63, 317 (2021). Kim, M.-J. et al. The Association of the Exposure to Work-Related Traumatic Events and Work Limitations among Firefighters: A Cross-Sectional Study. Int. J. Environ. Res. Public. Health 16, 756 (2019). Nazari, G. et al. Prevalence of exposure to critical incidents in firefighters across Canada. Work 67, 215–222 (2020). Fullagar, H. H. K. et al. Australian firefighters perceptions of heat stress, fatigue and recovery practices during fire-fighting tasks in extreme environments. Appl. Ergon. 95, 103449 (2021). West, M. R., Costello, S., Sol, J. A. & Domitrovich, J. W. Risk for heat-related illness among wildland firefighters: job tasks and core body temperature change. Occup. Environ. Med. 77, 433–438 (2020). Barr, D., Reilly, T. & Gregson, W. The impact of different cooling modalities on the physiological responses in firefighters during strenuous work performed in high environmental temperatures. Eur. J. Appl. Physiol. 111, 959–967 (2011). Krawiec, P. et al. Chemical compounds released by combustion of polymer composites flat belts. Sci. Rep. 11, 8269 (2021). Krawiec, P. et al. The Toxicological Testing and Thermal Decomposition of Drive and Transport Belts Made of Thermoplastic Multilayer Polymer Materials. Polymers 12, 2232 (2020). Rabajczyk, A., Zielecka, M. & Małozięć, D. Hazards Resulting from the Burning Wood Impregnated with Selected Chemical Compounds. Appl. Sci. 10, 6093 (2020). Engelsman, M., Toms, L.-M. L., Banks, A. P. W., Wang, X. & Mueller, J. F. Biomonitoring in firefighters for volatile organic compounds, semivolatile organic compounds, persistent organic pollutants, and metals: A systematic review. Environ. Res. 188, 109562 (2020). Demers, P. A. et al. Carcinogenicity of occupational exposure as a firefighter. Lancet Oncol. 23, 985–986 (2022). Stec, A. A. et al. Occupational Exposure to Polycyclic Aromatic Hydrocarbons and Elevated Cancer Incidence in Firefighters. Sci. Rep. 8, 2476 (2018). Nowicki, T. W., Koszela, J. P. & Matuszelański, Ł. Virtual reality environment to study the ergonomic features of firefighters’ activity. MATEC Web Conf. 210, (2018). Mahmood, S., Nasir, S. H., Mamat, N., Abdul Rahman, I. & Azis, N. A. Ergonomics and Manual Handling Workplace Improvement: A Case Study of Firefighter at Pagoh. in Human-Centered Technology for a Better Tomorrow (eds. Hassan, M. H. A. et al.) 567–582 (Springer, 2022). doi: 10.1007/978-981-16-4115-2_46 . Boyd, L., Rogers, T., Docherty, D. & Petersen, S. Variability in performance on a work simulation test of physical fitness for firefighters. Appl. Physiol. Nutr. Metab. 40, 364–370 (2015). Sawhney, G., Jennings, K. S., Britt, T. W. & Sliter, M. T. Occupational stress and mental health symptoms: Examining the moderating effect of work recovery strategies in firefighters. J. Occup. Health Psychol. 23, 443–456 (2018). Fahy, R. F., LeBlanc, P. R. & Molis, J. L. Firefighter Fatalities in the United States-2016. Natl. Fire Prot. Assoc. (2017). DąBROWSK, A., Bartkowiak, G. & Szmechtyk, tomasz. Needs and expectations of firefighters towards smart protective clothing with the hazards warning system – results of survey research. Bezp. Pr. Nauka Prakt. 4, 22–25 (2019). Mandal, S. et al. A categorization tool for fabric systems used in firefighters’ clothing based on their thermal protective and thermo-physiological comfort performances. Text. Res. J. 89, 3244–3259 (2019). Zhang, X., Tian, M. & Li, J. Influence of smart textiles on the thermal protection performance of firefighters’ clothing: a review. J. Text. Inst. 0, 1–14 (2023). Shakeriaski, F. & Ghodrat, M. Challenges and limitation of wearable sensors used in firefighters’ protective clothing. J. Fire Sci. 40, (2022). Amidon, T. R. et al. Sensors and gizmos and data, oh my: informating firefighters’ personal protective equipment. Commun. Des. Q. 5, 15–30 (2018). Dąbrowska, A., Bartkowiak, G. & Kotas, R. Evaluation of Functionality of Warning System in Smart Protective Clothing for Firefighters. Sensors 21, 1767 (2021). Tsai, P.-F., Liao, C.-H. & Yuan, S.-M. Using Deep Learning with Thermal Imaging for Human Detection in Heavy Smoke Scenarios. Sensors 22, 5351 (2022). Garrity, D. J. & Yusuf, S. A. A predictive decision-aid device to warn firefighters of catastrophic temperature increases using an AI-based time-series algorithm. Saf. Sci. 138, 105237 (2021). Blecha, T., Soukup, R., Kaspar, P., Hamacek, A. & Reboun, J. Smart firefighter protective suit - functional blocks and technologies. in 2018 IEEE International Conference on Semiconductor Electronics (ICSE) C4–C4 (2018). doi: 10.1109/SMELEC.2018.8481335 . Bhuiyan, M. A. R., Wang, L., Shaid, A., Shanks, R. A. & Ding, J. Advances and applications of chemical protective clothing system. J. Ind. Text. 49, 97–138 (2019). Kim, H. H., Park, P. K., Kim, Y. S. & Hong, S. T. Study on the weight reduction of firefighter’s protective clothing by using air layer and aerogels. Fire Sci. Eng. 32, 81–88 (2018). Orr, R., Simas, V., Canetti, E., Maupin, D. & Schram, B. Impact of Various Clothing Variations on Firefighter Mobility: A Pilot Study. Safety 5, 1–18 (2019). Bhattacharjee, S., Joshi, R., Chughtai, A. A. & Macintyre, C. R. Graphene Modified Multifunctional Personal Protective Clothing. Adv. Mater. Interfaces 6, 1900622 (2019). Walczak, A. et al. Impact of the Development of the Design of Firefighter Helmets on the Mechanical Shock Absorption Capacity. Adv. Sci. Technol. Res. J. 17, 171–184 (2023). Roldán-Gómez, J. J., González-Gironda, E. & Barrientos, A. A Survey on Robotic Technologies for Forest Firefighting: Applying Drone Swarms to Improve Firefighters’ Efficiency and Safety. Appl. Sci. 11, 363 (2021). Eremina, T., Nesterov, M., Korolchenko, D. & Giletich, A. Problematic issues of quality, certification and tests of fire-fighting technical production. E3S Web Conf. 164, 14023 (2020). Kaczmarzyk, P., Warguła, Ł., Janik, P. & Krawiec, P. Influence of Measurement Methodologies for the Volumetric Air Flow Rate of Mobile Positive Pressure Fans on Drive Unit Performance. Energies 15, 3953 (2022). Warguła, Ł. et al. Effect of the Volumetric Flow Rate Measurement Methodology of Positive Pressure Ventilators on the Parameters of the Drive Unit. Energies 16, 4515 (2023). Warguła, Ł. & Kaczmarzyk, P. Legal Regulations of Restrictions of Air Pollution Made by Mobile Positive Pressure Fans—The Case Study for Europe: A Review. Energies 15, 7672 (2022). Kaczmarzyk, P., Janik, P., Klapsa, W. & Bugaj, G. Possibilities of Using Mobile Fans and the Parameters Conditioning the Effectiveness of Tactical Mechanical Ventilation. Saf. Fire Technol. Vol. 59, iss. 1, (2022). Kaczmarzyk, P., Klapsa, W., Janik, P. & Krawiec, P. Identification and Evaluation of Technical and Operational Parameters of Mobile Positive Pressure Ventilation Fans Used during Rescue Operations. Saf. Fire Technol. 58, 74 (2021). ANSI/AMCA Standard 240 – 15. Laboratory Methods of Testing Positive Pressure Ventilators for Aerodynamic Performance Rating. ANSI Wash. DC USA (2015). ISO 5221:1984. Air Distribution and Air Diffusion—Rules to Methods of Measuring air Flow Rate in an Air Handling Duct. ISO Geneva Switz. (1984). Lambert, K. & Merci, B. Experimental Study on the Use of Positive Pressure Ventilation for Fire Service Interventions in Buildings with Staircases. Fire Technol. 50, 1517–1534 (2014). Panindre, P., Mousavi, N. S. S. & Kumar, S. Improvement of Positive Pressure Ventilation by optimizing stairwell door opening area. Fire Saf. J. 92, 195–198 (2017). Ezekoye, O. A., Svensson, S. & Nicks, R. INVESTIGATING POSITIVE PRESSURE VENTILATION. (2007). Wieczorek, B. et al. Research on the distribution of axial excitation of positive pressure ventilators in the aspect of stability safety of the load-bearing frame. Adv Sci Technol Res J (2023). Kerber, S. & Walton, W. D. Full-scale evaluation of positive pressure ventilation in a fire fighter training building . NIST IR 7342 https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7342.pdf (2006) doi: 10.6028/NIST.IR.7342 . Garcia, K., Kauffmann, R. & Schelble, R. Positive Pressure Attack for Ventilation & Firefighting . (PennWell Books, 2006). Feng, X. & Li, Y. F. Evaluation of Positive Pressure Ventilation for High-Rise Buildings in Compartment Fire Situation. Adv. Mater. Res. 446–449, 2908–2913 (2012). Jian, Z. Design for Occupant Evacuation of Underground Exhibition - Beijing National Convention Center Redevelopment. Procedia Eng. 11, 737–744 (2011). Han, Z., Gong, L., Du, Z. & Duan, H. A Novel Environmental-Friendly Gel Dry-Water Extinguishant Containing Additives with Efficient Combustion Suppression Efficiency. Fire Technol. 56, 2365–2385 (2020). He, S. et al. Insight to hydrophobic SiO2 encapsulated SiO2 gel: Preparation and application in fire extinguishing. J. Hazard. Mater. 405, 124216 (2021). Saenko, E. V. et al. Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations. ACS Appl Nano Mater 3, 2221–2233 (2020). Kerber, S. & Walton, W. D. Effect of positive pressure ventilation on a room fire . NIST IR 7213 https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7213.pdf (2005) doi: 10.6028/NIST.IR.7213 . Bembenek, M. Exploring efficiencies: Examining the possibility of decreasing the size of the briquettes used as the batch in the electric arc furnace dust processing line. Sustainability 12, 6393 (2020). Bembenek, M., Buczak, M. & Baiul, K. Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method. Materials 15, 4901 (2022). Warguła, Ł. et al. Characterizing Sawdust Fractional Composition from Oak Parquet Woodworking for Briquette and Pellet Production. Adv. Sci. Technol. Res. J. 17, 236–247 (2023). Alianto, B., Nasruddin, N. & Nugroho, Y. S. High-rise building fire safety using mechanical ventilation and stairwell pressurization: A review. J. Build. Eng. 50, 104224 (2022). Madrzykowski, D. & Kerber, S. Firefighting Technology Research at NIST. Fire Eng. 161, (2008). Giełżecki, J. & Wolański, M. Technology research of tactical personal protection clothing based on firefighters-rescuers. Secur. Dimens. 12, 34–46 (2014). Han, J., Zhang, Y., Li, S., Huang, B. & Wu, D. Stator modification methods for diagonal flow fans to achieve noise reduction of rotor-stator interaction. J. Mech. Sci. Technol. 36, 785–796 (2022). Peng, Z., Wu, Y., Tian, J. & Ouyang, H. Discrete noise control of cooling fan module: Stator and rotor interaction. Appl. Acoust. 165, 107308 (2020). Gülcan, H. E., Gülteki̇n, N. & Ci̇ni̇vi̇z, M. Effect of diesel injection pressure for enhancing combustion and reducing mechanical vibration and noise emissions in a non-road diesel engine. Eur. Mech. Sci. 7, 199–208 (2023). Szpica, D. Research on the influence of LPG/CNG injector outlet nozzle diameter on uneven fuel dosage. Transport 33, 186–196 (2018). Szpica, D. Validation of indirect methods used in the operational assessment of LPG vapor phase pulse injectors. Measurement 118, 253–261 (2018). Matasova, O. & Tupov, V. Calculation of the required noise reduction of a engine exhaust system. MATEC Web Conf. 320, (2020). Warguła, Ł., Kaczmarzyk, P. & Dziechciarz, A. The assessment of fire risk of non-road mobile wood chopping machines. J. Res. Appl. Agric. Eng. Vol. 64, (2019). Wargula, Ł., Waluś, K. J. & Krawiec, P. The problems of measuring the temperature of the small engines (SI) on the example of a drive for non-road mobile machines. MATEC Web Conf. 254, (2019). Čižiūnienė, K., Matijošius, J., Čereška, A. & Petraška, A. Algorithm for Reducing Truck Noise on Via Baltica Transport Corridors in Lithuania. Energies 13, 6475 (2020). Warguła, Ł., Lijewski, P. & Kukla, M. Effects of Changing Drive Control Method of Idling Wood Size Reduction Machines on Fuel Consumption and Exhaust Emissions. Croat. J. For. Eng. 44, 137–151 (2023). Warguła, Ł., Lijewski, P. & Kukla, M. Influence of non-commercial fuel supply systems on small engine SI exhaust emissions in relation to European approval regulations. Environ. Sci. Pollut. Res. 29, 55928–55943 (2022). Rodrigues, G. S. et al. A Study on the Viability of Adopting Battery Electric Vehicles in Bus Rapid Transit in Brazil Using the AHP Method. Energies 16, 4858 (2023). Tucki, K., Orynycz, O. & Dudziak, A. The Impact of the Available Infrastructure on the Electric Vehicle Market in Poland and in EU Countries. Int. J. Environ. Res. Public. Health 19, 16783 (2022). Bénichou, N. & Sultan, M. A. Thermal properties of lightweight-framed construction components at elevated temperatures. Fire Mater. 29, 165–179 (2005). Sága, M. et al. Experimental Determination of the Manson – Coffin Curves for an Original Unconventional Vehicle Frame. Materials 13, 4675 (2020). Castorrini, A., Barnabei, V. F., Corsini, A. & Rispoli, F. Strongly Coupled Fluid-Structure Interaction Simulation of a 3D Printed Fan Rotor. in (American Society of Mechanical Engineers Digital Collection, 2019). doi: 10.1115/GT2019-91296 . Myagkov, L. L., Mahkamov, K., Chainov, N. D. & Makhkamova, I. 11 - Advanced and conventional internal combustion engine materials. in Alternative Fuels and Advanced Vehicle Technologies for Improved Environmental Performance (ed. Folkson, R.) 370–408e (Woodhead Publishing, 2014). doi: 10.1533/9780857097422.2.370 . Lewis, A. M., Keoleian, G. & Kelly, J. The Potential of Lightweight Materials and Advanced Combustion Engines to Reduce Life Cycle Energy and Greenhouse Gas Emissions . https://www.sae.org/publications/technical-papers/content/2014-01-1963 / (2014) doi: 10.4271/2014-01-1963 . Weng, M. C., Yu, L. X., Liu, F. & Nielsen, P. V. Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal. Tunn. Undergr. Space Technol. 42, 96–104 (2014). Razeghi, S. M. J., Safarzadeh, M. & Pasdarshahri, H. Evaluation of air curtain and emergency exhaust system for smoke confinement of an enclosure. J. Build. Eng. 33, 101650 (2021). Nguyen, T. D. & Bui, H. M. Computational fluid dynamic model for smoke control of building basement. Case Stud. Chem. Environ. Eng. 7, 100318 (2023). Węgrzyński, W. & Krajewski, G. Influence of wind on natural smoke and heat exhaust system performance in fire conditions. J. Wind Eng. Ind. Aerodyn. 164, 44–53 (2017). Albuquerque, D. P., Sandberg, M., Linden, P. F. & Carrilho da Graça, G. Experimental and numerical investigation of pumping ventilation on the leeward side of a cubic building. Build. Environ. 179, 106897 (2020). Ghodrat, M., Shakeriaski, F., Nelson, D. J. & Simeoni, A. Existing Improvements in Simulation of Fire–Wind Interaction and Its Effects on Structures. Fire 4, 27 (2021). NOGOWCZYK, P., Pałka, A. & Szczęśniak, G. THE INFLUENCE OF MASS PARAMETERS OF THE BODY ON ACTIVE SAFETY OF A FIRE ENGINE IN TERMS OF THE SELECTION OF CHASSIS. Arch. Automot. Eng. – Arch. Motoryz. 82, 87–98 (2018). Kaczmarzyk, P., Warguła, Ł. & Janik, P. Experimental studies of the influence of mobile fan positioning parameters on the ability to transport the air stream into the door opening. Sci. Rep. 13, 14976 (2023). Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 11 May, 2024 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 24 Feb, 2024 Reviews received at journal 22 Feb, 2024 Reviewers agreed at journal 15 Feb, 2024 Reviews received at journal 22 Jan, 2024 Reviewers agreed at journal 22 Jan, 2024 Reviewers invited by journal 18 Jan, 2024 Editor assigned by journal 18 Jan, 2024 Editor invited by journal 15 Jan, 2024 Submission checks completed at journal 15 Jan, 2024 First submitted to journal 29 Dec, 2023 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-3821970","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":267297894,"identity":"0fa18318-384a-4edf-8b52-6e9095eb7849","order_by":0,"name":"Piotr Kaczmarzyk","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA3klEQVRIiWNgGAWjYDACHjiLjfEBA8MBEIvxALFamA2gWhiI1sImQZQWc57DDz/+zLHLl5+Rllbxc8cdOXMG3gN4tVj2thlLSG5LtmyckXbsZu+ZZ8aWDXwJeLUYnGcwYzDcxmzALJHedpux7XDihgM8BgS0sH9jSNxWb8AG1FJMnJazPWYMB7cdNuCRSDvGTJQWy54zxZKN244bSPA8S5bsbQP6pZmAX8x50jd+/Lmt2kC+Pc3ww882YIix9x58gNdhcJZAAlSEmQe7Ukwt/AdgIgS0jIJRMApGwYgDAGJRTqMJT9/xAAAAAElFTkSuQmCC","orcid":"","institution":"National Research Institute","correspondingAuthor":true,"prefix":"","firstName":"Piotr","middleName":"","lastName":"Kaczmarzyk","suffix":""},{"id":267297895,"identity":"591110dd-33df-417d-a0ec-9343ebc49c9f","order_by":1,"name":"Łukasz Warguła","email":"","orcid":"","institution":"Poznań University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Łukasz","middleName":"","lastName":"Warguła","suffix":""},{"id":267297896,"identity":"137bb4b5-53c0-4538-9c20-19edeba08369","order_by":2,"name":"Paweł Janik","email":"","orcid":"","institution":"National Research Institute","correspondingAuthor":false,"prefix":"","firstName":"Paweł","middleName":"","lastName":"Janik","suffix":""},{"id":267297897,"identity":"81b586fd-7b84-4d96-a49e-dddef09e640b","order_by":3,"name":"Piotr Krawiec","email":"","orcid":"","institution":"Poznań University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Piotr","middleName":"","lastName":"Krawiec","suffix":""},{"id":267297898,"identity":"33c0d22c-ff49-4e27-87b4-ec3dd73306b2","order_by":4,"name":"Damian Bąk","email":"","orcid":"","institution":"National Research Institute","correspondingAuthor":false,"prefix":"","firstName":"Damian","middleName":"","lastName":"Bąk","suffix":""},{"id":267297899,"identity":"5a2cee0a-d77a-4f03-b5ca-2734ce420d29","order_by":5,"name":"Wojciech Klapsa","email":"","orcid":"","institution":"National Research Institute","correspondingAuthor":false,"prefix":"","firstName":"Wojciech","middleName":"","lastName":"Klapsa","suffix":""}],"badges":[],"createdAt":"2023-12-29 17:29:11","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-3821970/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-3821970/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1038/s41598-024-61507-3","type":"published","date":"2024-05-11T21:17:58+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":49733083,"identity":"87979d03-c5fa-4fba-8dd0-7c6407a486dd","added_by":"auto","created_at":"2024-01-17 06:41:42","extension":"png","order_by":1,"title":"Figure 1","display":"","copyAsset":false,"role":"figure","size":508832,"visible":true,"origin":"","legend":"\u003cp\u003eExecution of positive pressure ventilation technique inside a car garage\u003c/p\u003e","description":"","filename":"floatimage1.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/938d4465d512f8cd3b712672.png"},{"id":49733082,"identity":"ea4a8e37-5071-4e62-b6ca-ba3f630ee133","added_by":"auto","created_at":"2024-01-17 06:41:42","extension":"png","order_by":2,"title":"Figure 2","display":"","copyAsset":false,"role":"figure","size":205923,"visible":true,"origin":"","legend":"\u003cp\u003eResearch plan\u003c/p\u003e","description":"","filename":"floatimage2.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/6c353a754368d7b4add2b23a.png"},{"id":49733078,"identity":"ddd732c5-8f6d-431f-bfe5-39ed8bbfb1a5","added_by":"auto","created_at":"2024-01-17 06:41:42","extension":"png","order_by":3,"title":"Figure 3","display":"","copyAsset":false,"role":"figure","size":57050,"visible":true,"origin":"","legend":"\u003cp\u003eUsing positive pressure ventilators during rescue operations or cyclic exercises.\u003c/p\u003e","description":"","filename":"floatimage3.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/24ff1deed03eb45dabd0f574.png"},{"id":49733080,"identity":"cb5644ef-7e70-44b3-a981-1f6308cb0421","added_by":"auto","created_at":"2024-01-17 06:41:42","extension":"png","order_by":4,"title":"Figure 4","display":"","copyAsset":false,"role":"figure","size":136427,"visible":true,"origin":"","legend":"\u003cp\u003eActivities for which firefighters use positive pressure ventilators, where: a – removing thermal decomposition products and accumulated heat in the building space (technique: positive pressure ventilation); b – removing thermal decomposition products and accumulated heat in the building space (technique: negative pressure ventilation); c – removing smoke from the building space after the fire has been located (smoke extraction); d – PPA positive pressure attack (combination of extinguishing action and mechanical positive pressure ventilation); e – operations involving fires on free-standing objects (e.g. cars, waste containers); f – supplying air to areas where people may be present and oxygen concentrations may be reduced.\u003c/p\u003e","description":"","filename":"floatimage4.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/59096a9cd4f6f1058114b684.png"},{"id":49733874,"identity":"de3f6274-1e23-4e1b-9be6-60338139e393","added_by":"auto","created_at":"2024-01-17 06:49:42","extension":"png","order_by":5,"title":"Figure 5","display":"","copyAsset":false,"role":"figure","size":177023,"visible":true,"origin":"","legend":"\u003cp\u003eDifficulties encountered during ventilator set-up and operation, where: a – insufficient inflow capacity of the airflow generated by the ventilator; b – operation time of the ventilator; c – unit size too large; d – impaired mobility of the unit (e.g. too much weight); e –presence of defects relating to ventilator mechanisms (e.g. changes in the discharge angle); f – defects in the drive system; g – defects in ventilator components related to poor workmanship; h – no markings indicating the optimal position of the unit; i – problems with the power supply; j – noise; k – exhaust gas emissions (for ventilators driven by an internal combustion engine); l – inability to provide a proper inlet or inlet opening; m – inability to provide an effective gas exchange path (supply-exhaust distance); n – problems with the correct positioning in terms of distance and angle of discharge in front of the inlet or outlet opening; o – adverse environmental conditions affecting rescue operations (e.g. strong wind).\u003c/p\u003e","description":"","filename":"floatimage5.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/dd26742dfb6db58f75442eec.png"},{"id":49733084,"identity":"c3d4883f-657b-44b7-9892-4d9395218a63","added_by":"auto","created_at":"2024-01-17 06:41:42","extension":"png","order_by":6,"title":"Figure 6","display":"","copyAsset":false,"role":"figure","size":7639594,"visible":true,"origin":"","legend":"\u003cp\u003eInformation to assist in positioning the rescue ventilator.\u003c/p\u003e","description":"","filename":"floatimage6.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/32f98ee1d106da00cfe2a1f0.png"},{"id":49733875,"identity":"67a1a743-0fcb-45be-b3cd-68b74f65a615","added_by":"auto","created_at":"2024-01-17 06:49:42","extension":"png","order_by":7,"title":"Figure 7","display":"","copyAsset":false,"role":"figure","size":149905,"visible":true,"origin":"","legend":"\u003cp\u003eRescue ventilator with exhaust system from the combustion engine, where: 1 – exhaust manifold with silencer, 2 – exhaust gas duct.\u003c/p\u003e","description":"","filename":"floatimage7.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/126491d7f607d3739d4b8d76.png"},{"id":49733085,"identity":"9305a266-b61e-431f-a75e-4c31264b6b2a","added_by":"auto","created_at":"2024-01-17 06:41:43","extension":"png","order_by":8,"title":"Figure 8","display":"","copyAsset":false,"role":"figure","size":180849,"visible":true,"origin":"","legend":"\u003cp\u003eExpectations of firefighters towards the development of rescue ventilators, where: a – increasing in the inflow volume of the airflow generated by the mobile ventilator (capacity); b – extending of the effective operating time of the mobile ventilator; c – reducing the size of the ventilator; d – reducing the weight of the unit; e – reliability (failure-free); f – reducing noise levels; g – increasing the efficiency of flue gas extraction.\u003c/p\u003e","description":"","filename":"floatimage8.png","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/39685f06df5a812ead7593ed.png"},{"id":56488144,"identity":"b233c6ba-7718-44f8-8517-2a57f6ab20a1","added_by":"auto","created_at":"2024-05-14 21:29:27","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3438179,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-3821970/v1/bf93361c-7bb0-4642-87ab-a506fcfdd984.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service","fulltext":[{"header":"Introduction","content":"\u003cp\u003eThe activities of the officers of fire protection units are often associated with exposure to various hazards \u003csup\u003e1\u0026ndash;3\u003c/sup\u003e. Such risks include exposure to high temperatures \u003csup\u003e4\u0026ndash;6\u003c/sup\u003e, smoke emissions (toxic decomposition products) \u003csup\u003e7\u0026ndash;9\u003c/sup\u003e and exposure to strong chemicals \u003csup\u003e10\u0026ndash;12\u003c/sup\u003e. In recent years, more and more attention has been paid to aspects of work ergonomics \u003csup\u003e13,14\u003c/sup\u003e and the physical \u003csup\u003e15\u003c/sup\u003e and mental health of firefighters \u003csup\u003e16\u003c/sup\u003e. As reported in a statistical study presented by the National Fire Protection Association (NFPA) in 2017, 38% of firefighter deaths in the U.S. were due to cardiovascular problems, 38% to internal injuries, and 15% were related to involvement in an accident \u003csup\u003e17\u003c/sup\u003e. In order to improve the safety and working conditions of firefighters, in addition to statistical studies of accidents, surveys are also carried out to take into account tips to improve work, by the rescuers themselves. Such research can include studies on firefighter ergonomics conducted by Dąbrowska and Bartowiak in 2019 \u003csup\u003e18\u003c/sup\u003e. The research team presented information on identifying the needs of firefighters in relation to smart protective clothing with a hazard signalling system in surveys. In the survey, respondents showed many important features that this type of clothing should have, including a cooling system, location sensor, thermal imaging camera, and chemical concentration sensor. In addition, the firefighters identified several features related to the ergonomics of this type of clothing, including weight, freedom of movement and durability of the materials. Such research is the basis for determining the direction of development of firefighters\u0026rsquo; clothing, e.g., like the aforementioned cooling system \u003csup\u003e19,20\u003c/sup\u003e, location sensor \u003csup\u003e21\u0026ndash;23\u003c/sup\u003e, thermal imaging camera \u003csup\u003e24,25\u003c/sup\u003e, chemical concentration sensor \u003csup\u003e26,27\u003c/sup\u003e, weight reduction \u003csup\u003e28\u003c/sup\u003e, improvement of freedom of movement \u003csup\u003e29\u003c/sup\u003e and material durability \u003csup\u003e30,31\u003c/sup\u003e. Survey tests were also conducted by Roldan-Gomez et. al. in 2021 \u003csup\u003e32\u003c/sup\u003e on the quality of using firefighters\u0026rsquo; equipment. The team studied the tools used in prevention, extinguishment and observation activities in forest areas. In their publication, the authors presented the main problems that accompany rescue operations, such as the lack of human and material resources, lack of sufficient real-time information on the course and development of a fire.\u003c/p\u003e \u003cp\u003eDue to the nature of the firefighter\u0026rsquo;s work, i.e. working in an extreme fire environment (often under time pressure), in order to minimize the risks they experience they should have the right tools with a high level of reliability. Equipment used to carry out rescue operations is subject to additional testing and certification before it is approved for use. In Poland and other countries, admittance for use of products is determined by the results of laboratory tests, which are carried out for the purpose of carrying out the process of certification and admittance of such products \u003csup\u003e33\u003c/sup\u003e. Unfortunately, not all devices are subject to the admittance process. In case of positive pressure ventilators, no research methods have been implemented to comprehensively evaluate the effectiveness of these devices \u003csup\u003e34\u0026ndash;36\u003c/sup\u003e. Ventilators are characterized by a wide spectrum of operation. According to Kaczmarzyk et al. in 2022 \u003csup\u003e34\u003c/sup\u003e, these devices can be used for, among other things: positive pressure (Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e.) and under pressure ventilation (PPV), positive pressure attack (PPA), assisting evacuation from a fire-affected facility, suppressing fires of free-standing structures, etc. \u003csup\u003e37\u003c/sup\u003e.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eTaking into account the important role of rescue ventilators in the implementation of rescue operations, CNBOP-PIB (Scientific and Research Centre for Fire Protection \u0026ndash; National Research Institute) in J\u0026oacute;zef\u0026oacute;w, Poland, has begun to implement the construction of a research infrastructure allowing the evaluation of the most important features determining the effectiveness of this type of equipment. Among the most important characteristics that can determine the effectiveness of rescue operations are: the size of the generated jet; the area of jet dispersion as a function of distance; noise; the length of operating time, as well as the weight and dimensions of the device \u003csup\u003e38\u003c/sup\u003e. The developed range of the apparatus is a flow tunnel made in accordance with the requirements of ANSI/AMCA 240\u0026thinsp;\u0026minus;\u0026thinsp;22 and PN-EN ISO 5801 \u003csup\u003e39,40\u003c/sup\u003e. Referring to the importance of the problem related to the design and construction of test apparatus dedicated to the comprehensive conformity assessment processes of all ventilators used in rescue operations, it was also decided to ask firefighters themselves about the aspects of using these devices. As part of this project, it was decided to conduct a survey of officers of the National Fire Service (PSP) in order to most accurately tailor the research program of positive pressure ventilators and specifically address those features that need improvement according to the declarations of direct users \u0026ndash; rescue firefighters. The survey were formulated to learn about the frequency of using this type of equipment, to learn about the specifics of using positive pressure ventilators, to identify difficulties and weaknesses related to commissioning and use; and to inquire about technical issues of the ventilators that firefighters believe may need improvement and refinement.\u003c/p\u003e \u003cp\u003eThe purpose of the article is to identify operational difficulties and design flaws in emergency ventilators based on the opinions of their users. In addition, the circumstances and frequency of using these devices were determined, along with obtaining information on expected developments. The survey was performed on the basis of questionnaires conducted among professional rescue firefighters directly involved in rescue operations in Poland.\u003c/p\u003e\n\u003ch3\u003eEthical issues\u003c/h3\u003e\n\u003cp\u003eThe obtained survey results were checked and approved by the Ethics Committee of the Scientific and Research Center for Fire Protection - National Research Institute. The research was conducted taking into account approved guidelines. The consent to conduct the study was given by the Chief Commander of the State Fire Service in Poland. Additionally, each respondent was informed that participation in the study was voluntary. Each respondent who took part in the survey gave informed consent and accepted the terms of participation.\u003c/p\u003e"},{"header":"Material and methods","content":"\u003cp\u003eAerial surveys were conducted with professional emergency firefighters directly involved in rescue operations employed by the State Fire Service in Poland. The questionnaire form (using the \u0026ldquo;Google\u0026rdquo; protocol) was distributed through 16 Provincial Headquarters of the State Fire Service (location: Białystok, Gdańsk, Gorz\u0026oacute;w Wielkopolski, Katowice, Kielce, Lublin, Ł\u0026oacute;dź, Olsztyn, Opole, Poznań, Rzesz\u0026oacute;w, Szczecin, Toruń, Wrocław, Warsaw), to 496 subordinate rescue and firefighting units, located throughout the country. The survey was conducted in a voluntary form, so of the 25,000 eligible to participate, 682 officers completed it. The survey was conducted between July 2022 and March 2023 (Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e).\u003c/p\u003e \u003cp\u003eThe survey contained 5 questions. 4 of the questions were closed-ended, but they also had the option to expand the topic, introduce additional description and expand the answer to the issue the question addressed. Question 5, on the other hand, was strictly open-ended. For the first question only, respondents had a choice of one answer. In other questions, firefighters had the opportunity to select multiple answers.\u003c/p\u003e \u003cp\u003eThe first question (\u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e) addressed the issue of using mobile ventilators \u0026ldquo;Do you use mobile ventilators during rescue operations or cyclic exercises?\u0026rdquo;. The indicated question was in a way identifying the respondent. The respondent had the option to answer the question in two ways, i.e. yes or no. If the answer was affirmative to the question, the respondent moved on to the next question in the survey. On the other hand, if he or she denied it and selected the answer \u0026lsquo;no\u0026rsquo;, at this stage this resulted in terminating participation in the survey.\u003c/p\u003e \u003cp\u003eThe second question (\u003cspan citationid=\"CR2\" class=\"CitationRef\"\u003e2\u003c/span\u003e) was related to identifying the activities for which firefighters use positive pressure ventilators. The question was \u0026ldquo;What activities do you use the positive pressure ventilator for?\u0026rdquo;. In the area of closed questions, the respondent had a choice of 6 answers, labelled a to f respectively, which were:\u003c/p\u003e \u003cp\u003e \u003col style=\"list-style-type:lower-alpha;\"\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eRemoval of thermal decomposition products and accumulated heat in the building space (technique: positive pressure ventilation);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eRemoval of thermal decomposition products and accumulated heat in the building space (technique: vacuum ventilation);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eSmoke removal from the building space after the location of a fire (smoke extraction);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003ePPA positive pressure attack (combination of extinguishing action and mechanical ventilation with mechanical positive pressure ventilation);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eAction on fires in free-standing structures (e.g. cars, waste containers);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eProviding air to areas where people may be present and oxygen concentrations may be reduced.\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003c/ol\u003e \u003c/p\u003e \u003cp\u003eFor the indicated question, respondents were also given the opportunity to include an additional open-ended comment, where they could indicate additional activities for which positive pressure ventilators are used.\u003c/p\u003e \u003cp\u003eThe next question (\u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e) in the survey concerned the difficulties associated with the use of positive pressure ventilators. Respondents read the question \u0026ldquo;What difficulties did you encounter during the activities of making and using a positive pressure ventilator?\u0026rdquo; As part of the closed answers assigned to the indicated question, firefighters were given the opportunity to select 15 answers (letter designation \u0026lsquo;a\u0026rsquo; to \u0026lsquo;o\u0026rsquo;), which related to the following operational problems:\u003c/p\u003e \u003cp\u003e \u003col style=\"list-style-type:lower-alpha;\"\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eInsufficient efficiency of the incoming airflow generated by the ventilator;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eVentilator operating time;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eToo large a unit;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eImpaired mobility of the unit (e.g. too much weight);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003ePresence of defects related to ventilator mechanisms (e.g. changes in the discharge angle);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eMalfunctions in the drive system;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eDefects in ventilator components related to poor workmanship;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eNo markings indicating the optimal position of the unit;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eProblems with the power supply;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eNoise;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eExhaust gas emissions (for ventilators driven by an internal combustion engine);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eInability to provide a proper inlet or inlet opening;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eInability to provide an effective gas exchange path (supply-exhaust distance);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eProblems with the correct positioning in terms of distance and angle of discharge in front of the inlet or outlet opening;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eAdverse environmental conditions affecting rescue operations (e.g. strong wind).\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003c/ol\u003e \u003c/p\u003e \u003cp\u003eFor this question (\u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e), firefighters were also given the opportunity to include an additional response within an open-ended description, where they could indicate difficulties and problems associated with the operation of positive pressure ventilators other than those listed.\u003c/p\u003e \u003cp\u003eQuestion four (\u003cspan citationid=\"CR4\" class=\"CitationRef\"\u003e4\u003c/span\u003e) of the survey was aimed at identifying the weaknesses of positive pressure ventilators and identifying directions for improvement of the equipment. The question was as follows: \u0026ldquo;What are your expectations for improving the technical and performance characteristics of positive pressure ventilators? Which features should be modified?\u0026rdquo;. In this case, respondents were able to mark up to seven responses at a time, indicated by the letters \u0026lsquo;a\u0026rsquo; to \u0026lsquo;g\u0026rsquo;. The closed-form answers were as follows:\u003c/p\u003e \u003cp\u003e \u003col style=\"list-style-type:lower-alpha;\"\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eIncreasing in the inflow volume of the airflow generated by the mobile ventilator (capacity);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eExtending of the effective operating time of the mobile ventilator;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eReducing the size of the ventilator;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eReducing the weight of the unit;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eReliability (failure-free);\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eReducing noise levels;\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003cspan\u003e \u003cli\u003e \u003cp\u003eIncreasing the efficiency of flue gas extraction.\u003c/p\u003e \u003c/li\u003e \u003c/span\u003e \u003c/ol\u003e \u003c/p\u003e \u003cp\u003eIn this case, respondents also had the option to include an additional open-ended response.\u003c/p\u003e \u003cp\u003eThe last question (\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e) included in the survey was typically open-ended and its purpose was to identify additional insights related to the operation of positive pressure ventilators not previously asked about in the survey. The question was: \u0026ldquo;What are your other observations that you would like to share regarding the technical and operational performance of positive pressure ventilators?\u0026rdquo;. As part of this question, respondents were given the opportunity to formulate any observation about the equipment and to point out various problems related to its operation.\u003c/p\u003e"},{"header":"Results and discussion","content":"\u003cp\u003eAnalysing the answers to the first question on using mobile ventilators during rescue operations or cyclic exercises, out of all the respondents (682 firefighters), 666 replied in the affirmative, i.e. 97.7% of the respondents (Fig.\u0026nbsp;\u003cspan refid=\"Fig3\" class=\"InternalRef\"\u003e3\u003c/span\u003e). In contrast, a negative response was indicated by 2.3% of respondents (16 people). According to Lambert and Merci, PPV has been widely used among Belgian firefighters for more than 20 years \u003csup\u003e41\u003c/sup\u003e. The use of PPV significantly improves the safety of firefighters and rescued persons hence it is widely used as clearly confirmed by the scientific community \u003csup\u003e42\u0026ndash;44\u003c/sup\u003e.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eReferring to the results of the second question related to the identification of activities in which positive pressure ventilators are used, respondents emphatically showed that the most common activity is the removal of smoke from a building space after a fire has been extinguished (92.2% of respondents). As the second most frequently mentioned activity, firefighters indicated the implementation of smoke extraction during internal fires using positive pressure ventilation (72.4% of respondents). Responses related to smoke extraction are the most anticipated, as a large group of researchers also raise the issue for this purpose \u003csup\u003e45\u0026ndash;47\u003c/sup\u003e. The least popular answer among respondents was \u0026lsquo;e\u0026rsquo;, i.e. Actions related to fires of detached structures (7.5%) (Fig.\u0026nbsp;\u003cspan refid=\"Fig4\" class=\"InternalRef\"\u003e4\u003c/span\u003e). The issue of extinguishing, for example, cars \u003csup\u003e48\u003c/sup\u003e using PPV is a little recognised scientific topic and may also be little publicised among professional firefighters. As part of their open-ended response to this question, firefighters listed situations in which they use PPV:\u003c/p\u003e \u003cp\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003esupplying air for faster burning of hydrophobic material;\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003egeneration of positive pressure in passageways to ensure evacuation conditions;\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003esupplying more air to a fire in order to burn it out more quickly (e.g. haystacks);\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003ecooling of objects heated by high temperatures;\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eventilation of the facility after a gas leak using an explosion-proof ventilator to reduce its concentration;\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003eremoving carbon monoxide from dwellings;\u003c/p\u003e \u003c/li\u003e \u003cli\u003e \u003cp\u003erouting of fire gases.\u003c/p\u003e \u003c/li\u003e \u003c/ul\u003e \u003c/p\u003e \u003cp\u003eThe information obtained from the open-ended responses is often a new or non-classical approach in the application of PPV during rescue and firefighting operations. Using PPV to post-combust hydrophobic material is not an encountered approach in the literature and requires research into the justification of this method. However, the issue of using hydrophobic materials in extinguishing processes is a current scientific topic, e.g. hydrophobic coatings in dry water methods \u003csup\u003e49\u003c/sup\u003e, extinguishing gel \u003csup\u003e50\u003c/sup\u003e, hydrophobic silica nanoparticles as additives to improve extinguishing agents \u003csup\u003e51\u003c/sup\u003e. Methods of controlled afterburning of ignitable material are justified and, as Kerber and Walton in 2005 point out, PPV can contribute to an increase in the rate of combustion \u003csup\u003e52\u003c/sup\u003e. The delivery of an air jet can facilitate the combustion of compacted materials \u003csup\u003e53\u0026ndash;55\u003c/sup\u003e. The routing of exhaust gases and the cleaning of passageways using PPVs are extinguishing methods known and described, for example, by Alianto et al., 2022 \u003csup\u003e56\u003c/sup\u003e. In contrast, the cooling of objects heated by high temperatures is described by Madrzykowski and Kerber in 2008 \u003csup\u003e57\u003c/sup\u003e and Giełżecki and Wolański in 2014 of the protective clothing of firefighters \u003csup\u003e58\u003c/sup\u003e.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eIn question three, respondents answered a question about the type of difficulties encountered during the activities of setting up and using the ventilators. Firefighters demonstrated a number of problems (Fig.\u0026nbsp;\u003cspan refid=\"Fig5\" class=\"InternalRef\"\u003e5\u003c/span\u003e). The biggest problem identified by respondents is the accompanying noise (78.2%) and emissions of harmful exhaust gases, with equipment powered by combustion engines (68.5%) and difficulties in the mobility of the units, e.g. high weight (40.2%). Other inconveniences with using ventilators are indicated by between 21.9% and 5% of firefighters.\u003c/p\u003e \u003cp\u003eAnalysing the identified problems, future research should be carried out into what is the main source of noise: the operation of the combustion engine or the ventilator impeller. Development work is being carried out in both groups of noise sources. Noise-reducing rotor and stator geometries are being developed among ventilator designs \u003csup\u003e59,60\u003c/sup\u003e. On the other hand, in the midst of internal combustion engines, vibration and noise reduction is attempted by improving the combustion of the fuel-air mixture \u003csup\u003e61,62\u003c/sup\u003e, the design of mechanisms such as injection valves \u003csup\u003e63\u003c/sup\u003e or improving the damping of exhaust systems \u003csup\u003e64\u003c/sup\u003e. In the small-engine non-road designs used to drive rescue ventilators, the exhaust systems (which also dampen noise) through the compact design are quite small \u003csup\u003e65,66\u003c/sup\u003e. One way to reduce the negative impacts (noise \u003csup\u003e67\u003c/sup\u003e, emissions of harmful exhaust gases \u003csup\u003e35,68,69\u003c/sup\u003e, high temperatures \u003csup\u003e65,66\u003c/sup\u003e) of internal combustion engines is to replace them with electric motors \u003csup\u003e70,71\u003c/sup\u003e. However, within the group of emergency ventilator drive units, as demonstrated by Warguła and Kaczmarzyk in 2022 \u003csup\u003e36\u003c/sup\u003e on the Polish market the most popular are combustion powered ventilators with a power output ranging from 3.4 kW to 6.3 kW (approximately 50% of the market). On the other hand, electric ventilators are commonly offered in the smaller power range from 1.1 kW to 2.2 kW (74% of the electric ventilator market in Poland) \u003csup\u003e36\u003c/sup\u003e. Hence, for the time being, replacing internal combustion drives with electric drives, especially of greater power, seems difficult to implement in practice.\u003c/p\u003e \u003cp\u003eThe impediments to mobility when using these units, resulting from the high weight, can be reduced by using lighter construction materials for frames \u003csup\u003e72,73\u003c/sup\u003e, ventilator impellers \u003csup\u003e74\u003c/sup\u003e and motors \u003csup\u003e75,76\u003c/sup\u003e. Such materials are known, but the current problem is to produce ventilator parts from lightweight materials at a competitive price.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eProblems in using emergency ventilators exhibited by a group of about 10 to 20% of users include problems with the correct positioning of the unit: lack of markings indicating the optimal positioning of the unit, problems with the correct positioning in terms of distance and angle of the discharge in front of the inlet or outlet opening. Some manufacturers introduce markings attached to the ventilators to aid their correct positioning (Fig.\u0026nbsp;\u003cspan refid=\"Fig6\" class=\"InternalRef\"\u003e6\u003c/span\u003e). Measurement systems to aid their positioning could be one way forward, but there are none at present. Another perceived problem is the inadequate inflow capacity of the airflow generated by the ventilator, which can be improved by using more powerful drive units. At the same time, increasing the efficiency of the drive units can solve another problem: the unit is too large. Another group of problems relates to architectural considerations related to the inability to provide a proper inlet and intake opening, or the inability to provide an effective gas exchange path (supply-exhaust distance). Currently, this problem is in the minds of architects and they are taking such problems into account. For many structures, analyses of smoke movement are carried out in a computational fluid dynamics (CFD) environment \u003csup\u003e77\u0026ndash;79\u003c/sup\u003e to determine the precise geometry of buildings or tunnels, for example. The last problem mentioned in this group was adverse environmental conditions affecting rescue operations (e.g. strong winds). Wegrzynski and Krajewski in 2017 showed that wind force and the location of smoke extraction ventilators (roof or wall-mounted) significantly affect the smoke extraction capacity of buildings (up to 37%) \u003csup\u003e80\u003c/sup\u003e. Research is being conducted into the correlation of wind force and direction on a building\u0026rsquo;s smoke \u003csup\u003e81\u003c/sup\u003e or fire spreading capacity \u003csup\u003e82\u003c/sup\u003e that seeks to improve firefighting methods. However, there are no clear guidelines for the positioning of rescue ventilators in such a situation.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eThe problems perceived by a group of less than 10% of firefighters using ventilators are those related to the ventilator drive unit, i.e. its faults and operating time. According to the survey, the drive units used in the ventilators are of relatively high quality, with only 7.4 per cent of respondents reporting problems, although it is possible that some of them are using equipment that has been in operation for a long time and may have malfunctions due to wear. With regard to operating time, internal combustion engines are characterised by the absence of operating time limitations when refuelling, whereas battery-driven ventilators in this situation require the replacement of batteries or batteries with increased energy capacity. 9.5% of respondents perceive problems with mechanisms, e.g. changing the angle of the ventilators, and 6.3% other faults related to the poor quality of manufacture of these devices. The solution to this problem may lie in control tests that determine whether products are approved for use by the fire service. Additional problems reported by respondents include the injection of combustion products generated by the ventilators\u0026rsquo; combustion engine into the smoke-filled building (they are sucked up by the jet and injected into the building). These gases are also detected by carbon monoxide detectors, distorting the reading. The solution to this problem lies in systems that extract the exhaust gases outside the ventilator\u0026rsquo;s air intake area (Fig.\u0026nbsp;\u003cspan refid=\"Fig7\" class=\"InternalRef\"\u003e7\u003c/span\u003e). In addition to exhaust emissions, a perceived problem is the vibration of the diesel-powered device, which can result in a change in its position, relative to the initial setting. This problem was studied and analysed by Wieczorek et al. in 2023 \u003csup\u003e44\u003c/sup\u003e indicating values for the selection of vibration dampers and vibration isolators that can prevent the equipment from affecting the ground or the operators. Another problem relates to the positioning in the fire vehicle, where it is, according to respondents, positioned too high. This is an individual problem for manufacturers of firefighting vehicle equipment bodies, but this information can be a new design guideline, as the main emphasis in the design methodology to date has been on the position of the vehicle\u0026rsquo;s centre of gravity \u003csup\u003e83\u003c/sup\u003e.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eQuestion four focused on firefighters\u0026rsquo; expectations and indicated the expected developments for mobile ventilators based on user feedback. The largest percentage of users, 81.7%, expect a reduction in noise levels and up to 53.5\u0026ndash;48.3% expect a reduction in weight and size. This is the most popular expectation among firefighters, and it is noticeable that these are issues that directly affect them when transporting the equipment or operating it. The next comments relate to improvements in the extraction capacity of smoke from buildings: 46.4 per cent of respondents expect to increase the efficiency of smoke extraction and 33.2 per cent expect to improve the building\u0026rsquo;s air purification capacity by increasing the size of the incoming airflow from around the building. Between 14.3 and 15.5% of respondents expect an increase in the effective operating time of the mobile ventilator and an increase in the device\u0026rsquo;s reliability (Fig.\u0026nbsp;\u003cspan refid=\"Fig8\" class=\"InternalRef\"\u003e8\u003c/span\u003e).\u003c/p\u003e \u003cp\u003eAdditional expectations and desired improvements reported by respondents include, for example, increasing the range of possibilities for setting the angle of the ventilator impeller (also introducing control of the direction of the airstream below the horizontal axis). Currently, in the commonly used units, the value for changing the position of the ventilator impeller from the horizontal is between 0\u0026deg; and 18\u0026deg; (upward airflow direction), with the most common four recommended positions \u003csup\u003e84\u003c/sup\u003e. The remaining open-ended responses related to drive units, reducing CO emissions from internal combustion engines and reducing the cost of purchasing electric-powered ventilators with increased uptake.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003eThe last question was open-ended and concerned proposals for improving the technical and performance characteristics of mobile ventilators. Only those not mentioned directly or indirectly in the earlier questions were analysed. The development or dissemination of dedicated extractor ventilators is expected. Such a solution could be useful for smoke extraction in confined spaces where the positive pressure method is not effectively applicable (e.g. basements without windows). With regard to this aspect, aeration sleeves are a helpful tool. With this solution, it is possible to supply air to any area of the room to be ventilated and the inlet opening (e.g. a door) can be used as an exhaust point. An important feature advocated by respondents is the design of ventilator housings to facilitate cleaning. Such structures are contaminated with soot and oily carbon build-up especially on the blades and rotor housing and cowl after smoke removal. Currently, most commercial designs are characterised by the time-consuming and complicated removal of the rotor housing, which makes maintenance of the unit difficult. At the same time, problems are reported with the installation of the light foam net or the compatibility of the aeration sleeves. Firefighters expect the aeration sleeves to be standardised, as they see problems connecting them and connecting them to ventilators if they are made by different manufacturers. Ventilator operators also expect wheels to aid their mobility, as not all units are equipped with them, and wheel chocks for units with significant vibration. Limitations on the use of positive pressure ventilation due to the extinguishing of the internal combustion engine due to a deficit of oxygen in the fuel-air mixture. The advantages and disadvantages of electric and combustion fan drives are recognized, hence there are proposals for electric-fuel hybrid drives. We can conclude that the authors have in mind a kind of parallel hybrid, but a solution where two sources of propulsion would work simultaneously would not eliminate most of the disadvantages. Thus, it can be concluded that the authors of the answer are referring to a fan with two independent drives, used depending on demand and operating conditions, for example, in an open space with a combustion drive, and in a closed space with an electric drive. A similar increase in the universality of the fan can be achieved by a hybrid series drive, which would rely mainly on a fan with an electric motor powered by a generator through electric wires from a greater distance, the solution eliminates one of the major drawbacks of electric fans, namely the battery (the main disadvantages cited: limitation in energy storage capacity, durability, purchase cost).\u003c/p\u003e \u003cp\u003eIn addition to design expectations, firefighters report a need for more training in the area of using ventilators during rescue operations, especially with regard to operations during a fire. Firefighters also expect inspections of the equipment admitted for use, as there are known cases of new equipment being purchased with very low efficiency, and thus ineffective in rescue operations. The number of ventilators per unit in a particular province is also expected to increase.\u003c/p\u003e"},{"header":"Conclusion","content":"\u003cp\u003eOne of the ways to identify directions for the development of mobile ventilators, in terms of improving their use, are surveys of firefighters who actively use these devices during rescue and firefighting operations. Firefighters in Poland use these devices 92.2% of the time to ventilate buildings after a fire is extinguished or during a fire (72.4%). One of the non-classical uses of these devices is to supply more air to a fire in order to burn it out faster (e.g. haystacks). Difficulties cited during the use of these devices were mainly: noise (78.2%), exhaust emissions (68.5%), and difficulties in mobility through the relatively heavy weight of the device (40.2%). Other inconveniences were mentioned by less than 20% of firefighters. Polish firefighters expect the development of these devices in terms of direct impacts on their bodies, namely reducing noise (81.7%) and decreasing the weight and size of fans (about 50%), which require manual transport. Other expectations include improvements in building smoke removal: increasing the efficiency of smoke removal (46.4%) and the efficiency of building air purification by increasing the volume of incoming airflow from the building\u0026rsquo;s surroundings (33.2%). About 15% of firefighters expect changes in the operation of the ventilator itself, that is, an increase in the effective operating time (electric fans) and an increase in the unit\u0026rsquo;s uptime. Among the firefighters\u0026rsquo; comments in terms of improving technical and operational performance, not mentioned earlier, they expect: efficient and commercially available exhaust ventilator designs dedicated to smoke removal in confined spaces, ventilator housing designs that facilitate cleaning, easy-to-install and inter-manufacturer-compatible accessories such as aeration sleeves or foam systems, and wheeled transport support systems. In addition to the design expectations of firefighters, they report the need for more training in the area of ventilator use during rescue operations, especially taking into account actions during a fire. Firefighters also expect to inspect the equipment admitted for use, as there are known cases of new equipment being purchased with very low efficiency, and thus ineffective in rescue operations. In the existing literature, there is no analysis of expectations in the development direction of mobile ventilators, which studies have shown should continue to be developed structurally and their users trained in their use. A limitation of the research is the problem of using mobile ventilators by professional firefighters in the territory of only one of the European Union countries. These problems can vary significantly in more or less developed countries. Further research should be conducted on design changes to these units, e.g. less impactful drive units, more efficient air jet generators, more ergonomic frames during transport. In addition, there should be increased investment in training firefighters in the skills to use these devices during rescue operations.\u003c/p\u003e"},{"header":"Declarations","content":"\u003cp\u003eAvailability of Data and Materials\u003c/p\u003e\n\u003cp\u003eThe datasets generated and analysed during the current study are available in the Google Cloud repository: https://drive.google.com/drive/folders/1Qhhm8iD36sE9GLYU2hJhGBzzPot6ZhSP?usp=sharing\u003c/p\u003e\n\u003cp\u003eFunding\u003c/p\u003e\n\u003cp\u003eThe research presented in the article was carried out as part of the Ministry of Education and Science program’s “Implementation Doctorate” executed in 2020–2024 (agreement no. DWD/4/22/2020).\u003c/p\u003e\n\u003cp\u003eInstitutional Review Board Statement\u003c/p\u003e\n\u003cp\u003eNot applicable.\u003c/p\u003e\n\u003cp\u003eInformed Consent Statement\u003c/p\u003e\n\u003cp\u003eNot applicable.\u003c/p\u003e\n\u003cp\u003eData Availability Statement\u003c/p\u003e\n\u003cp\u003eNot applicable.\u003c/p\u003e\n\u003cp\u003eConflicts of Interest\u003c/p\u003e\n\u003cp\u003eThe authors declare no conflict of interest.\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\u003cli\u003e\u003cspan\u003eMaloney, S. R. \u003cem\u003eet al.\u003c/em\u003e Perceived Health Risks Among Firefighters; The New Jersey Firefighter Health Survey. J. Occup. Environ. Med. 63, 317 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKim, M.-J. \u003cem\u003eet al.\u003c/em\u003e The Association of the Exposure to Work-Related Traumatic Events and Work Limitations among Firefighters: A Cross-Sectional Study. Int. J. Environ. Res. Public. Health 16, 756 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eNazari, G. \u003cem\u003eet al.\u003c/em\u003e Prevalence of exposure to critical incidents in firefighters across Canada. Work 67, 215\u0026ndash;222 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFullagar, H. H. K. \u003cem\u003eet al.\u003c/em\u003e Australian firefighters perceptions of heat stress, fatigue and recovery practices during fire-fighting tasks in extreme environments. Appl. Ergon. 95, 103449 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWest, M. R., Costello, S., Sol, J. A. \u0026amp; Domitrovich, J. W. Risk for heat-related illness among wildland firefighters: job tasks and core body temperature change. Occup. Environ. Med. 77, 433\u0026ndash;438 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBarr, D., Reilly, T. \u0026amp; Gregson, W. The impact of different cooling modalities on the physiological responses in firefighters during strenuous work performed in high environmental temperatures. Eur. J. Appl. Physiol. 111, 959\u0026ndash;967 (2011).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKrawiec, P. \u003cem\u003eet al.\u003c/em\u003e Chemical compounds released by combustion of polymer composites flat belts. Sci. Rep. 11, 8269 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKrawiec, P. \u003cem\u003eet al.\u003c/em\u003e The Toxicological Testing and Thermal Decomposition of Drive and Transport Belts Made of Thermoplastic Multilayer Polymer Materials. Polymers 12, 2232 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eRabajczyk, A., Zielecka, M. \u0026amp; Małozięć, D. Hazards Resulting from the Burning Wood Impregnated with Selected Chemical Compounds. Appl. Sci. 10, 6093 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eEngelsman, M., Toms, L.-M. L., Banks, A. P. W., Wang, X. \u0026amp; Mueller, J. F. Biomonitoring in firefighters for volatile organic compounds, semivolatile organic compounds, persistent organic pollutants, and metals: A systematic review. Environ. Res. 188, 109562 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDemers, P. A. \u003cem\u003eet al.\u003c/em\u003e Carcinogenicity of occupational exposure as a firefighter. Lancet Oncol. 23, 985\u0026ndash;986 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eStec, A. A. \u003cem\u003eet al.\u003c/em\u003e Occupational Exposure to Polycyclic Aromatic Hydrocarbons and Elevated Cancer Incidence in Firefighters. Sci. Rep. 8, 2476 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eNowicki, T. W., Koszela, J. P. \u0026amp; Matuszelański, Ł. Virtual reality environment to study the ergonomic features of firefighters\u0026rsquo; activity. MATEC Web Conf. 210, (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMahmood, S., Nasir, S. H., Mamat, N., Abdul Rahman, I. \u0026amp; Azis, N. A. Ergonomics and Manual Handling Workplace Improvement: A Case Study of Firefighter at Pagoh. in \u003cem\u003eHuman-Centered Technology for a Better Tomorrow\u003c/em\u003e (eds. Hassan, M. H. A. et al.) 567\u0026ndash;582 (Springer, 2022). doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.1007/978-981-16-4115-2_46\u003c/span\u003e\u003cspan address=\"10.1007/978-981-16-4115-2_46\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBoyd, L., Rogers, T., Docherty, D. \u0026amp; Petersen, S. Variability in performance on a work simulation test of physical fitness for firefighters. Appl. Physiol. Nutr. Metab. 40, 364\u0026ndash;370 (2015).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSawhney, G., Jennings, K. S., Britt, T. W. \u0026amp; Sliter, M. T. Occupational stress and mental health symptoms: Examining the moderating effect of work recovery strategies in firefighters. J. Occup. Health Psychol. 23, 443\u0026ndash;456 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFahy, R. F., LeBlanc, P. R. \u0026amp; Molis, J. L. Firefighter Fatalities in the United States-2016. Natl. Fire Prot. Assoc. (2017).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDąBROWSK, A., Bartkowiak, G. \u0026amp; Szmechtyk, tomasz. Needs and expectations of firefighters towards smart protective clothing with the hazards warning system \u0026ndash; results of survey research. Bezp. Pr. Nauka Prakt. 4, 22\u0026ndash;25 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMandal, S. \u003cem\u003eet al.\u003c/em\u003e A categorization tool for fabric systems used in firefighters\u0026rsquo; clothing based on their thermal protective and thermo-physiological comfort performances. Text. Res. J. 89, 3244\u0026ndash;3259 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eZhang, X., Tian, M. \u0026amp; Li, J. Influence of smart textiles on the thermal protection performance of firefighters\u0026rsquo; clothing: a review. J. Text. Inst. 0, 1\u0026ndash;14 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eShakeriaski, F. \u0026amp; Ghodrat, M. Challenges and limitation of wearable sensors used in firefighters\u0026rsquo; protective clothing. J. Fire Sci. 40, (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eAmidon, T. R. \u003cem\u003eet al.\u003c/em\u003e Sensors and gizmos and data, oh my: informating firefighters\u0026rsquo; personal protective equipment. Commun. Des. Q. 5, 15\u0026ndash;30 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eDąbrowska, A., Bartkowiak, G. \u0026amp; Kotas, R. Evaluation of Functionality of Warning System in Smart Protective Clothing for Firefighters. Sensors 21, 1767 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eTsai, P.-F., Liao, C.-H. \u0026amp; Yuan, S.-M. Using Deep Learning with Thermal Imaging for Human Detection in Heavy Smoke Scenarios. Sensors 22, 5351 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGarrity, D. J. \u0026amp; Yusuf, S. A. A predictive decision-aid device to warn firefighters of catastrophic temperature increases using an AI-based time-series algorithm. Saf. Sci. 138, 105237 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBlecha, T., Soukup, R., Kaspar, P., Hamacek, A. \u0026amp; Reboun, J. Smart firefighter protective suit - functional blocks and technologies. in 2018 \u003cem\u003eIEEE International Conference on Semiconductor Electronics (ICSE)\u003c/em\u003e C4\u0026ndash;C4 (2018). doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.1109/SMELEC.2018.8481335\u003c/span\u003e\u003cspan address=\"10.1109/SMELEC.2018.8481335\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBhuiyan, M. A. R., Wang, L., Shaid, A., Shanks, R. A. \u0026amp; Ding, J. Advances and applications of chemical protective clothing system. J. Ind. Text. 49, 97\u0026ndash;138 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKim, H. H., Park, P. K., Kim, Y. S. \u0026amp; Hong, S. T. Study on the weight reduction of firefighter\u0026rsquo;s protective clothing by using air layer and aerogels. Fire Sci. Eng. 32, 81\u0026ndash;88 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eOrr, R., Simas, V., Canetti, E., Maupin, D. \u0026amp; Schram, B. Impact of Various Clothing Variations on Firefighter Mobility: A Pilot Study. Safety 5, 1\u0026ndash;18 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBhattacharjee, S., Joshi, R., Chughtai, A. A. \u0026amp; Macintyre, C. R. Graphene Modified Multifunctional Personal Protective Clothing. Adv. Mater. Interfaces 6, 1900622 (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWalczak, A. \u003cem\u003eet al.\u003c/em\u003e Impact of the Development of the Design of Firefighter Helmets on the Mechanical Shock Absorption Capacity. Adv. Sci. Technol. Res. J. 17, 171\u0026ndash;184 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eRold\u0026aacute;n-G\u0026oacute;mez, J. J., Gonz\u0026aacute;lez-Gironda, E. \u0026amp; Barrientos, A. A Survey on Robotic Technologies for Forest Firefighting: Applying Drone Swarms to Improve Firefighters\u0026rsquo; Efficiency and Safety. Appl. Sci. 11, 363 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eEremina, T., Nesterov, M., Korolchenko, D. \u0026amp; Giletich, A. Problematic issues of quality, certification and tests of fire-fighting technical production. E3S Web Conf. 164, 14023 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKaczmarzyk, P., Warguła, Ł., Janik, P. \u0026amp; Krawiec, P. Influence of Measurement Methodologies for the Volumetric Air Flow Rate of Mobile Positive Pressure Fans on Drive Unit Performance. Energies 15, 3953 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł. \u003cem\u003eet al.\u003c/em\u003e Effect of the Volumetric Flow Rate Measurement Methodology of Positive Pressure Ventilators on the Parameters of the Drive Unit. Energies 16, 4515 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł. \u0026amp; Kaczmarzyk, P. Legal Regulations of Restrictions of Air Pollution Made by Mobile Positive Pressure Fans\u0026mdash;The Case Study for Europe: A Review. Energies 15, 7672 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKaczmarzyk, P., Janik, P., Klapsa, W. \u0026amp; Bugaj, G. Possibilities of Using Mobile Fans and the Parameters Conditioning the Effectiveness of Tactical Mechanical Ventilation. Saf. Fire Technol. Vol. 59, iss. 1, (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKaczmarzyk, P., Klapsa, W., Janik, P. \u0026amp; Krawiec, P. Identification and Evaluation of Technical and Operational Parameters of Mobile Positive Pressure Ventilation Fans Used during Rescue Operations. Saf. Fire Technol. 58, 74 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eANSI/AMCA Standard 240\u0026thinsp;\u0026ndash;\u0026thinsp;15. Laboratory Methods of Testing Positive Pressure Ventilators for Aerodynamic Performance Rating. ANSI Wash. DC USA (2015).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eISO 5221:1984. Air Distribution and Air Diffusion\u0026mdash;Rules to Methods of Measuring air Flow Rate in an Air Handling Duct. ISO Geneva Switz. (1984).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eLambert, K. \u0026amp; Merci, B. Experimental Study on the Use of Positive Pressure Ventilation for Fire Service Interventions in Buildings with Staircases. Fire Technol. 50, 1517\u0026ndash;1534 (2014).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003ePanindre, P., Mousavi, N. S. S. \u0026amp; Kumar, S. Improvement of Positive Pressure Ventilation by optimizing stairwell door opening area. Fire Saf. J. 92, 195\u0026ndash;198 (2017).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eEzekoye, O. A., Svensson, S. \u0026amp; Nicks, R. INVESTIGATING POSITIVE PRESSURE VENTILATION. (2007).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWieczorek, B. \u003cem\u003eet al.\u003c/em\u003e Research on the distribution of axial excitation of positive pressure ventilators in the aspect of stability safety of the load-bearing frame. Adv Sci Technol Res J (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKerber, S. \u0026amp; Walton, W. D. \u003cem\u003eFull-scale evaluation of positive pressure ventilation in a fire fighter training building\u003c/em\u003e. NIST IR 7342 \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7342.pdf\u003c/span\u003e\u003cspan address=\"https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7342.pdf\" targettype=\"URL\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e (2006) doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.6028/NIST.IR.7342\u003c/span\u003e\u003cspan address=\"10.6028/NIST.IR.7342\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGarcia, K., Kauffmann, R. \u0026amp; Schelble, R. \u003cem\u003ePositive Pressure Attack for Ventilation \u0026amp; Firefighting\u003c/em\u003e. (PennWell Books, 2006).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eFeng, X. \u0026amp; Li, Y. F. Evaluation of Positive Pressure Ventilation for High-Rise Buildings in Compartment Fire Situation. Adv. Mater. Res. 446\u0026ndash;449, 2908\u0026ndash;2913 (2012).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eJian, Z. Design for Occupant Evacuation of Underground Exhibition - Beijing National Convention Center Redevelopment. Procedia Eng. 11, 737\u0026ndash;744 (2011).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eHan, Z., Gong, L., Du, Z. \u0026amp; Duan, H. A Novel Environmental-Friendly Gel Dry-Water Extinguishant Containing Additives with Efficient Combustion Suppression Efficiency. Fire Technol. 56, 2365\u0026ndash;2385 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eHe, S. \u003cem\u003eet al.\u003c/em\u003e Insight to hydrophobic SiO2 encapsulated SiO2 gel: Preparation and application in fire extinguishing. J. Hazard. Mater. 405, 124216 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSaenko, E. V. \u003cem\u003eet al.\u003c/em\u003e Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations. ACS Appl Nano Mater 3, 2221\u0026ndash;2233 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKerber, S. \u0026amp; Walton, W. D. \u003cem\u003eEffect of positive pressure ventilation on a room fire\u003c/em\u003e. NIST IR 7213 \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7213.pdf\u003c/span\u003e\u003cspan address=\"https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir7213.pdf\" targettype=\"URL\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e (2005) doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.6028/NIST.IR.7213\u003c/span\u003e\u003cspan address=\"10.6028/NIST.IR.7213\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBembenek, M. Exploring efficiencies: Examining the possibility of decreasing the size of the briquettes used as the batch in the electric arc furnace dust processing line. Sustainability 12, 6393 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eBembenek, M., Buczak, M. \u0026amp; Baiul, K. Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method. Materials 15, 4901 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł. \u003cem\u003eet al.\u003c/em\u003e Characterizing Sawdust Fractional Composition from Oak Parquet Woodworking for Briquette and Pellet Production. Adv. Sci. Technol. Res. J. 17, 236\u0026ndash;247 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eAlianto, B., Nasruddin, N. \u0026amp; Nugroho, Y. S. High-rise building fire safety using mechanical ventilation and stairwell pressurization: A review. J. Build. Eng. 50, 104224 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMadrzykowski, D. \u0026amp; Kerber, S. Firefighting Technology Research at NIST. Fire Eng. 161, (2008).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGiełżecki, J. \u0026amp; Wolański, M. Technology research of tactical personal protection clothing based on firefighters-rescuers. Secur. Dimens. 12, 34\u0026ndash;46 (2014).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eHan, J., Zhang, Y., Li, S., Huang, B. \u0026amp; Wu, D. Stator modification methods for diagonal flow fans to achieve noise reduction of rotor-stator interaction. J. Mech. Sci. Technol. 36, 785\u0026ndash;796 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003ePeng, Z., Wu, Y., Tian, J. \u0026amp; Ouyang, H. Discrete noise control of cooling fan module: Stator and rotor interaction. Appl. Acoust. 165, 107308 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eG\u0026uuml;lcan, H. E., G\u0026uuml;lteki̇n, N. \u0026amp; Ci̇ni̇vi̇z, M. Effect of diesel injection pressure for enhancing combustion and reducing mechanical vibration and noise emissions in a non-road diesel engine. Eur. Mech. Sci. 7, 199\u0026ndash;208 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSzpica, D. Research on the influence of LPG/CNG injector outlet nozzle diameter on uneven fuel dosage. Transport 33, 186\u0026ndash;196 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eSzpica, D. Validation of indirect methods used in the operational assessment of LPG vapor phase pulse injectors. Measurement 118, 253\u0026ndash;261 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMatasova, O. \u0026amp; Tupov, V. Calculation of the required noise reduction of a engine exhaust system. MATEC Web Conf. 320, (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł., Kaczmarzyk, P. \u0026amp; Dziechciarz, A. The assessment of fire risk of non-road mobile wood chopping machines. J. Res. Appl. Agric. Eng. Vol. 64, (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWargula, Ł., Waluś, K. J. \u0026amp; Krawiec, P. The problems of measuring the temperature of the small engines (SI) on the example of a drive for non-road mobile machines. MATEC Web Conf. 254, (2019).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eČižiūnienė, K., Matijošius, J., Čereška, A. \u0026amp; Petraška, A. Algorithm for Reducing Truck Noise on Via Baltica Transport Corridors in Lithuania. Energies 13, 6475 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł., Lijewski, P. \u0026amp; Kukla, M. Effects of Changing Drive Control Method of Idling Wood Size Reduction Machines on Fuel Consumption and Exhaust Emissions. Croat. J. For. Eng. 44, 137\u0026ndash;151 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWarguła, Ł., Lijewski, P. \u0026amp; Kukla, M. Influence of non-commercial fuel supply systems on small engine SI exhaust emissions in relation to European approval regulations. Environ. Sci. Pollut. Res. 29, 55928\u0026ndash;55943 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eRodrigues, G. S. \u003cem\u003eet al.\u003c/em\u003e A Study on the Viability of Adopting Battery Electric Vehicles in Bus Rapid Transit in Brazil Using the AHP Method. Energies 16, 4858 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eTucki, K., Orynycz, O. \u0026amp; Dudziak, A. The Impact of the Available Infrastructure on the Electric Vehicle Market in Poland and in EU Countries. Int. J. Environ. Res. Public. Health 19, 16783 (2022).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eB\u0026eacute;nichou, N. \u0026amp; Sultan, M. A. Thermal properties of lightweight-framed construction components at elevated temperatures. Fire Mater. 29, 165\u0026ndash;179 (2005).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eS\u0026aacute;ga, M. \u003cem\u003eet al.\u003c/em\u003e Experimental Determination of the Manson\u0026thinsp;\u0026ndash;\u0026thinsp;Coffin Curves for an Original Unconventional Vehicle Frame. Materials 13, 4675 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eCastorrini, A., Barnabei, V. F., Corsini, A. \u0026amp; Rispoli, F. Strongly Coupled Fluid-Structure Interaction Simulation of a 3D Printed Fan Rotor. in (American Society of Mechanical Engineers Digital Collection, 2019). doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.1115/GT2019-91296\u003c/span\u003e\u003cspan address=\"10.1115/GT2019-91296\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eMyagkov, L. L., Mahkamov, K., Chainov, N. D. \u0026amp; Makhkamova, I. 11 - Advanced and conventional internal combustion engine materials. in \u003cem\u003eAlternative Fuels and Advanced Vehicle Technologies for Improved Environmental Performance\u003c/em\u003e (ed. Folkson, R.) 370\u0026ndash;408e (Woodhead Publishing, 2014). doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.1533/9780857097422.2.370\u003c/span\u003e\u003cspan address=\"10.1533/9780857097422.2.370\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eLewis, A. M., Keoleian, G. \u0026amp; Kelly, J. \u003cem\u003eThe Potential of Lightweight Materials and Advanced Combustion Engines to Reduce Life Cycle Energy and Greenhouse Gas Emissions\u003c/em\u003e. \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://www.sae.org/publications/technical-papers/content/2014-01-1963\u003c/span\u003e\u003cspan address=\"https://www.sae.org/publications/technical-papers/content/2014-01-1963\" targettype=\"URL\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e/ (2014) doi:\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e10.4271/2014-01-1963\u003c/span\u003e\u003cspan address=\"10.4271/2014-01-1963\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e.\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWeng, M. C., Yu, L. X., Liu, F. \u0026amp; Nielsen, P. V. Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal. Tunn. Undergr. Space Technol. 42, 96\u0026ndash;104 (2014).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eRazeghi, S. M. J., Safarzadeh, M. \u0026amp; Pasdarshahri, H. Evaluation of air curtain and emergency exhaust system for smoke confinement of an enclosure. J. Build. Eng. 33, 101650 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eNguyen, T. D. \u0026amp; Bui, H. M. Computational fluid dynamic model for smoke control of building basement. Case Stud. Chem. Environ. Eng. 7, 100318 (2023).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eWęgrzyński, W. \u0026amp; Krajewski, G. Influence of wind on natural smoke and heat exhaust system performance in fire conditions. J. Wind Eng. Ind. Aerodyn. 164, 44\u0026ndash;53 (2017).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eAlbuquerque, D. P., Sandberg, M., Linden, P. F. \u0026amp; Carrilho da Gra\u0026ccedil;a, G. Experimental and numerical investigation of pumping ventilation on the leeward side of a cubic building. Build. Environ. 179, 106897 (2020).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eGhodrat, M., Shakeriaski, F., Nelson, D. J. \u0026amp; Simeoni, A. Existing Improvements in Simulation of Fire\u0026ndash;Wind Interaction and Its Effects on Structures. Fire 4, 27 (2021).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eNOGOWCZYK, P., Pałka, A. \u0026amp; Szczęśniak, G. THE INFLUENCE OF MASS PARAMETERS OF THE BODY ON ACTIVE SAFETY OF A FIRE ENGINE IN TERMS OF THE SELECTION OF CHASSIS. Arch. Automot. Eng. \u0026ndash; Arch. Motoryz. 82, 87\u0026ndash;98 (2018).\u003c/span\u003e\u003c/li\u003e \u003cli\u003e\u003cspan\u003eKaczmarzyk, P., Warguła, Ł. \u0026amp; Janik, P. Experimental studies of the influence of mobile fan positioning parameters on the ability to transport the air stream into the door opening. Sci. Rep. 13, 14976 (2023).\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"noise, exhaust emissions, occupational safety, firefighter, building smoke ventilation, positive pressure ventilation (ppv), fire protection units, survey","lastPublishedDoi":"10.21203/rs.3.rs-3821970/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-3821970/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003ePositive pressure ventilators used by 97.7% of officers of the National Fire Service in Poland, are characterized by work that is not in line with the expectations of the firefighters. In order to improve the technical and operational features of these devices, a survey was conducted among 25,000 eligible firefighters, identifying the application of these devices, problems in use and expected development directions. A total of 682 officers voluntarily completed the survey. Based on their findings, it was determined that ventilators are most often used to smoke out buildings after or during a fire. Mentioned problems when using these devices were mainly noise (78.2%), exhaust emissions (68.5%), and impediments to mobility through the device\u0026rsquo;s relatively heavy weight (40.2%). Other inconveniences were mentioned by less than 20% of firefighters. Polish firefighters expect the development of these devices mainly in terms of the above-mentioned features (noise reduction (81.7%) and reduction of the weight and size of the ventilators (about 50%)). Other expectations relate to the improvement of smoke removal in buildings: increasing the efficiency of smoke removal (46.4%) and efficiency regarding the rate of smoke removal in a building by increasing the size of the incoming airflow from the building\u0026rsquo;s surroundings (33.2%). About 15% of firefighters expect changes in the operation of the ventilator itself, that is, an increase in the effective operating time (electric ventilators) and an increase in the device\u0026rsquo;s uptime. The article also presents suggestions for device development based on the available state of the art.\u003c/p\u003e","manuscriptTitle":"Problems of operation of positive pressure ventilators on the basis of surveys of Polish officers of the State Fire Service","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-01-17 06:41:37","doi":"10.21203/rs.3.rs-3821970/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2024-02-24T11:48:03+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-02-22T14:07:11+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"b4854824-c05c-4eb6-af61-5e725abece41","date":"2024-02-15T12:20:10+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-01-22T15:51:50+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"fcb4bb5b-d9d4-4244-9311-65f47595e799","date":"2024-01-22T12:24:55+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2024-01-18T12:36:35+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2024-01-18T12:25:38+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2024-01-15T12:18:30+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2024-01-15T12:10:11+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2023-12-29T17:20:22+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"9c9aedd3-4069-4b85-91c4-eb6571e912f6","owner":[],"postedDate":"January 17th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":28158100,"name":"Biological sciences/Ecology/Fire ecology"},{"id":28158101,"name":"Physical sciences/Engineering/Civil engineering"}],"tags":[],"updatedAt":"2024-05-14T21:23:01+00:00","versionOfRecord":{"articleIdentity":"rs-3821970","link":"https://doi.org/10.1038/s41598-024-61507-3","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2024-05-11 21:17:58","publishedOnDateReadable":"May 11th, 2024"},"versionCreatedAt":"2024-01-17 06:41:37","video":"","vorDoi":"10.1038/s41598-024-61507-3","vorDoiUrl":"https://doi.org/10.1038/s41598-024-61507-3","workflowStages":[]},"version":"v1","identity":"rs-3821970","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-3821970","identity":"rs-3821970","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}