- Backdraft
A backdraft is a situation which can occur when a
fire is starved ofoxygen ; consequently combustion ceases but the fuel gases andsmoke 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 an explosive effect as the gases heat and expand (see alsoFlashover ).Characteristic signs of a backdraft situation include yellow or brown smoke, smoke which exits small holes in puffs (a sort of breathing effect) and is often found around the edges of doors and windows, and windows which appear brown or black when viewed from the exterior. These darker colors are caused by incomplete
combustion . If the room contains a lot ofsoot , it indicates that the room lacks enough oxygen to permit combustion.Firefighter s often look to see if there is soot on the inside of windows and in cracks around in the room. The window might have cracked because of the heat. The windows of the structure may also have a slight vibration due to the pressure differentials. The surrounding environment (e.g. the hallway outside the suspected backdraft room) will be extremely hot.If firefighters discover a room pulling air into itself, for example through a crack, they should evacuate immediately, because this is a strong indication that a backdraft is imminent. Due to pressure differentials, these puffs of smoke are sometimes "sucked" back into the enclosed space from which they emanate, which is where the term "backdraft" originates.
Backdrafts are very dangerous situations, often surprising firefighters, regardless of their level of experience. The most common tactic used by firefighters in defusing a potential backdraft is to ventilate from the highest point, allowing the heat and smoke to escape without igniting explosively.
In Popular Culture
Backdrafts entered popular consciousness through the film of the same name where a serial arsonist was using them as a means of assassinating people.
See also
* [http://stilbild.nu/backdraft.jpgA backdraft captured by four photos]
*Flashover
*Backdraft (film)
* [http://brandskydda.stilbild.nu/Backdraft.avi video of a backdraft in four seconds]Resources
* Hall, Richard & Adams, Barbara (1998). Essentials of firefighting (4th ed.). International Fire Service Training Association. ISBN 0-87939-149-9.
* [http://www.firetactics.com/service.htm White Smoke Warning]
Wikimedia Foundation. 2010.
