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NOTES

Flashover - A transition phase in the development of a compartment fire in which surfaces exposed to thermal radiation reach ignition temperatures more or less simultaneously and fire spreads rapidly throughout the space. (NFPA 921, 2014, Pg. 16)

Thermally driven, HHR exceeds heat loss in compartment.

Energy feedback loop - more heat, more involvement, more heat.

Post flashover steady state HHR.

Compartment normally ventilation controlled post flashover.

Fire resistance ratings and special separation between buildings based on temperatures expected in post-flashover fires