Web Definition: Back Draft
A backdraft is a situation which can occur when a fire is starved of oxygen ; consequently combustion ceases but the fuel gases & smoke remain at high temperature. If oxygen is re-introduced to the fire, eg. by opening a door to a closed room, combustion can restart often resulting in a near-explosive effect as the gases heat & expand. This effect is the basis for the synonym smoke explosion. Characteristic signs include yellow or brown smoke, smoke which exits small holes in puffs & windows which appear brown or black when viewed from the exterior. These darker colors are caused by incomplete combustion. This is a very dangerous situation, often surprising even professional firefighters. The most common tactic used by firefighters in defusing a potential backdraft is to ventilate from the highest point, allowing the heat & smoke to escape without igniting explosively.
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