What happens to a gas appliance located under ventilating equipment when the extinguishing system activates if the appliance does not require protection?

• A. Manually shut off
• B. Automatically shut off
• C. Remain energized
• D. Ventilate

Answer: (B)

When the extinguishing system for the ventilating hood activates, the fuel gas supply to any gas-fired equipment directly beneath the hood is automatically shut off. This automatic gas shutoff is built into the system so that, even if the appliance itself doesn’t require protection, the gas is stopped as soon as the extinguishing agent is released. Stopping the fuel prevents gas from feeding the fire and helps the suppression system do its job. Manual shutoff would delay response, keeping the appliance energized would continue to feed the fire, and ventilation isn’t the action that stops the fuel supply.