When rollover is observed during a fire operation, which action is appropriate?

• A. Direct attack
• B. Ventilation
• C. Indirect
• D. Cooling

Answer: (C)

Rollover means the hottest gases have accumulated near the ceiling and are ready to flash over, so your priority is to cool the upper layer from a safe position. An indirect attack does exactly this: you apply water into the upper layer or across the ceiling with a fog pattern from a doorway or exterior, so you absorb heat and slow or stop flashover without sending firefighters into the most hazardous zone. This reduces heat in the room while you establish control or prepare for further action.

Direct attack would require entering the space during rollover, which greatly increases the risk of entrapment from a sudden flashover. Ventilation can worsen conditions during rollover by introducing more oxygen and heat to the upper layer unless done very carefully and coordinated with suppression. Cooling is the goal, but the method to achieve it most safely and effectively during rollover is an indirect attack.