What occurs during a backdraft?

A backdraft occurs when a fire has consumed most of the available oxygen in a confined space, and the conditions are ripe for an explosion. When fresh oxygen is suddenly introduced, for example, through a door or window that has been opened, it can lead to a rapid and violent ignition of the hot gases that have been building up. This explosive reaction often happens without warning and can be extremely dangerous for firefighters and anyone nearby.

The phenomenon is closely associated with fire behavior in enclosed spaces, emphasizing the need for careful tactics and awareness of ventilation during firefighting operations. Understanding this helps firefighters take necessary precautions to prevent backdrafts when entering a structure that is potentially involved in such a situation.