Fire rollover occurs when superheated, unburned gases rise and collect near the ceiling of an enclosed space. As these gases mix with oxygen and reach ignition temperature, they ignite suddenly, creating rolling flames across the upper layer of the room. This can happen even when materials on the floor have not yet caught fire. Flashover is a more extreme stage of fire development. It happens when heat from the fire raises the temperature of all exposed combustible surfaces in a room to their ig

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