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Flame over definition5/29/2023 ![]() Location and height of doors, windows and openings.Ambient temperature at the beginning of the fire.Contents and their relative surfaces, materials, etc.Shape, area and volume of the compartment.So what are the factors involved in a flashover? Here are some, compiled from various sources: NFPA 921 defines flashover as, "A transitional phase in the development of a compartment fire in which surfaces exposed to thermal radiation reach its ignition temperature more or less simultaneously and fire spreads rapidly throughout the space resulting in full room involvement or total involvement of the compartment or enclosed area." flashover factors To understand how to get out of a flashover, we must first understand what a flashover is. ![]() Preventing backdraft through vertical ventilation
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