Backdraft Fire vs Water Shield: Firefighting Science Revealed

A backdraft occurs when a fire burns in an enclosed space with little ventilation, consuming most of the available oxygen. As the flames die down, heat continues to drive off flammable gases and smoke, which build up under pressure inside the space. When a door, window, or other opening is made, oxygen suddenly rushes in and mixes with these hot gases, causing them to ignite explosively. This rapid ignition produces the violent blast known as a backdraft, often signaled beforehand by smoke pulsing from gaps, soot-stained windows, and air being drawn inward.

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