What is backdraft and what warning signs might you observe?

• A. A sudden ignition when air enters a closed space; warning signs include heavy, dark smoke, high heat, and a closed door/window.
• B. A gradual cooling of the space with clear airflow.
• C. A sudden explosive ignition when air enters a closed space; warning signs include heavy, dark smoke, high heat, and a closed door/window.
• D. A steady flame front with no smoke.

Answer: (C)