A hood exhaust fan shall continue to ______ after the extinguishing system has been activated unless fan shut down is required by a listed component of the ventilation system or by the design of the extinguishing system.

• A. Shut down
• B. Operate
• C. Restart
• D. Cease

Answer: (B)

When a hood fire suppression system is activated, the exhaust fan should keep moving air to remove heat, smoke, and any extinguishing agent from the hood and ductwork. This continued operation helps prevent smoke buildup, reduces the chance of re-ignition, and protects both occupants and equipment. The only time the fan should stop is if a listed component of the ventilation system or the extinguishing system’s design requires it to shut down. Shutting down or ceasing would leave the area with accumulated heat and smoke, increasing hazards, while restarting after shutdown isn’t the intended action.