First action when signs of impending flashover appear?

• A. Vent horizontally
• B. Perform direct attack
• C. Withdraw immediately
• D. Vent vertically

Answer: (C)

When signs of impending flashover appear, the priority is to withdraw immediately to a safe location. Flashover means the space is about to reach a point where everything in the room can ignite almost simultaneously, creating a rapidly escalating and deadly heat environment. Attempting to push further into the fire, vent horizontally or vertically, or continuing a direct attack at that moment is extremely risky and unlikely to succeed; it can trap or seriously injure firefighters by feeding the fire or changing the flame path in dangerous ways. After retreating, regroup, reassess the situation, and plan a safer defensive approach or wait for conditions to improve before re-engaging.