A backdraft is a rapid, explosive ignition of superheated gases within a structure when oxygen is reintroduced to an oxygen-depleted environment. This phenomenon typically occurs when an entry point, such as a door or window, is opened, allowing fresh air to enter a space that has been heated by fire. The sudden influx of oxygen can lead to a violent ignition of trapped flammable gases, posing significant risks to firefighters. Not to be confused with flashover, which involves the simultaneous ignition of combustible materials in a room, backdraft is often associated with specific conditions that can be assessed using tools like thermal imaging cameras (TIC).
Category context: Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.