Backdraft

For other uses, see Backdraft (disambiguation).

A backdraft (North American English), backdraught (British English)[1] or smoke explosion is the abrupt burning of superheated gases in a fire caused when oxygen rapidly enters a hot, oxygen-depleted environment; for example, when a window or door to an enclosed space is opened or broken. Backdrafts are typically seen as a blast of smoke and/or flame out of an opening of a building. Backdrafts present a serious threat to firefighters. There is some debate concerning whether backdrafts should be considered a type of flashover.

A firefighter demonstrates the behavior of a backdraft during live-fire training
Explosive combustion of hydrogen. Escaping hydrogen is ignited, while the removal of the bottom cap allows air to enter. Eventually, the air mixes with the hydrogen inside the container, causing an explosion. A similar process occurs during a backdraft, with the introduction of oxygen and mixing with unburnt gases causing abrupt or even explosive combustion
  1. ^ "Control measure - Understand signs and symptoms of backdraught". www.ukfrs.com. Fire Central Programme Office. 1 July 2021. Archived from the original on 9 July 2021. Retrieved 1 July 2021.