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August 14 – Study of the Fire Service Training Environment: Safety, Fidelity, and Exposure

The UL Firefighter Safety Research Institute will lead a 3-year Technology Research and Development Project examining the fire service’s training environment. The increased understanding of fire behavior that has emerged from previous AFG funded research has raised many questions that revolve around teaching these principles during hands-on training. Most training buildings or props, when used according to current training standards, will not create an environment that effectively demonstrates the impact of firefighting tactics (i.e. ventilation and suppression) on fire behavior. Despite ongoing financial and time restrictions, firefighter training academies must continually produce firefighters who have a thorough understanding of fire dynamics and are able to transfer that knowledge to tasks and tactics on the fireground. Firefighter training standards provide important constraints on fuel (type, arrangement and quantity) and the structure (geometry and materials) as a result of past incidents where firefighters have been injured or killed in training. With all of these limitations, the potential exists for students to observe and internalize inaccurate concepts such as “ventilation always leads to cooling”, “ventilation always reduces the chance of flashover” and “enter the fire room before flowing water.” It is imperative that fire instructors are able to provide the correct context to the students so that the proper lessons are learned, even if they are not visible, while providing a safe and predictable training environment.

This will be accomplished through four series of experiments that will provide the source data and visuals needed to understand the differences between the training environment and actual fire incidents. First off, fuels commonly used in training as well as those found in actual fires will be characterized for heat release rate, burning characteristics, and products of combustion. The training fuels will then be placed into a ranch style home previously utilized in research projects to better understand the impact of horizontal, vertical and positive pressure ventilation as well as suppression tactics. These results will be compared with over 50 experiments previously conducted in this test fixture utilizing realistic fuels. In the second series of experiments, realistic and training fuels will be compared in a concrete fire training building to examine the differences in fire dynamics and response to different ventilation and suppression tactics. The third series will include training prop experiments, which will examine the impact of a commonly used prop geometry and wall lining materials for their impact on fidelity, visual cues, long-term viability of the props, linkages to existing training, and potential thermal and chemical exposure of instructors and students. Finally, a series of experiments will be conducted utilizing innovative fire training configurations that are being used in the fire service to try to improve fire training fidelity while maintaining a safe and environmentally friendly training environment.

This research study is needed in order to address the challenge and bridge the gap of transferring knowledge and skills from the training ground to the fireground. A comprehensive fire service outreach program will make sure that this science meets the street. This research will support the NFPA 1403 Standard on Live Fire Training.

Purpose and Aims: The purpose of this study is to improve fire service knowledge of fire dynamics and the impact of their tactics through a better understanding of how the safety, fidelity and exposure of the training ground relates to the fire ground. This project will expand on previous research studies (2008 DHS – Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction, 2010 DHS – Effectiveness of Fire Service Vertical Ventilation and Suppression Tactics, 2012 DHS – Effectiveness of Positive Pressure Ventilation and 2012 FDNY, NIST, UL Partnership – Governors Island Experiments) that examined fire dynamics and fire service tactics and improve firefighter hands-on training. This will assist in the creation of thinking firefighters with a good foundation of fire dynamics from the beginning of their fire service careers that will impact their safety and effectiveness for many years.

Relevance: The fire service is in the midst of revamping their tactics as they adapt to the changing fire environment identified though previous research studies. These tactical changes require an evaluation of the principles of fire service operations, specifically ventilation and suppression. Traditionally, these tactics are taught with both classroom and hands-on evolutions in fire department training buildings. The modern fire environment responds much differently to ventilation and fire control than once believed. Current firefighter training lacks the visual, hands-on piece that teaches recruits how their tactics can affect the fire behavior in a structure. Many fire departments are working to develop modern training scenarios, however lack the data to bridge the gap between current training facilities and the fire behavior in residential structures identified though research conducted over the last 10 years.

Study Design and Methods: This study will utilize test methods from small-scale material tests to fullscale residential structure tests. In order to get the best understanding of the material and combustion properties of the training and realistic fuels utilized during this study, small-scale tests will utilize the cone calorimeter, Fourier Transform Infrared (FTIR) spectroscopic techniques, and gas chromatography and mass spectroscopy (GC/MS). These measurements will also be made throughout the study to understand the impact of ventilation and water application on smoke content and resulting exposure to firefighters. The fuel loads used in all of the experiments will also be characterized for their burning characteristics and heat release rate under a calorimetry hood in UL’s Large Fire Laboratory. Another series of experiments will take place under the calorimetry hood where training and realistic fuel loads will be placed in a fire service training prop with different wall lining materials that are commonly used by the fire service. These experiments will link the fire growth and exposure data from all of the previous experiments while different ventilation and suppression tactics are conducted with focus on the fidelity of the scenarios.

Additional experiments will be conducted in a ranch style test fixture that has been used for more than 50 horizontal, vertical, positive pressure and suppression experiments. Experiments in previous studies utilized “real” fuels. This series will utilize different training fuels with the same procedures used in the previous research experiments. This will show the difference between training fuels and “real” fuels providing context for firefighters and fire instructors. The same comparison will be made in a concrete fire training building. The same training fuels and “real” fuels will be used to quantify and qualify the differences in fire dynamics with the different structure and different fuels. Finally a series of experiments will examine different innovative training props and fuel loads that are being used in locations across the country. These props will be characterized and evaluated for safety, fidelity and exposure utilizing the experimental methods and measurements used in all of the previous experiments to make the connections where applicable.

Anticipated Outcomes: It is anticipated that the data and visuals collected from these experiments will provide firefighters and fire instructors with the material and knowledge needed to bridge the gap between fire dynamics in the training environment and fire dynamics at actual emergencies. This improved context will enhance the limited hands-on training opportunities that firefighters receive. This should lead to better decision making on the fire ground and more effective and efficient firefighting.


Goals and Objectives:

• Improve firefighter safety by increasing knowledge of fire behavior.

• Bridge the gap between fire dynamics knowledge and the utilization of training buildings and props for hands-on training.

• Characterize fuels commonly used in training and compare them to fuels found in the residential fire environment for both burning characteristics and potential firefighter exposure.

• Better understand the concepts of fuel and ventilation limited fires and research how they can be visually taught during hands-on fire training.

• Provide firefighters and fire instructors with an interactive training program that will provide context and a connection between the training environment and the fireground.