Define backdraft and one tactic to prevent it during interior operations.

Define backdraft and one tactic to prevent it during interior operations.

• A. A structural collapse due to heat; prevent by staying low.
• B. A dangerous ignition of enclosed fuel gases when air is introduced; prevent by controlling air, cooling with water, and using careful ventilation.
• C. A form of flashover caused by wind; prevent by shutting doors.
• D. A type of fuel leak; prevent by using fuel paint.

Answer: (B)

Backdraft happens when a fire burns in an enclosed space and heats up fuel-rich gases with little oxygen. If air is suddenly introduced, those gases can ignite explosively as the mixture finds its oxygen. The best way to prevent this during interior operations is to tightly control the air entering the space, aggressively cool the environment with water to reduce heat and gas buildup, and implement a careful ventilation plan to avoid a sudden influx of air. Controlling air means keeping openings limited and coordinating any air entry with the attack crew and the overall plan. Cooling with water lowers temperature and slows gas release, making ignition less likely. A deliberate ventilation approach removes heat and gases without creating dangerous air currents. The other options misdefine backdraft or suggest irrelevant measures, such as focusing on structural collapse, wind-driven flashover, or fuel leaks.