Exhaust systems shall be operated when cooking equipment is turned on. Which of the following best describes this requirement?

• A. Only during cooking
• B. When the equipment is turned on and exhaust is required
• C. Always regardless of cooking
• D. Whenever the cooking equipment is turned on

Answer: (D)

Exhaust ventilation should be on whenever cooking equipment is in use to capture heat, steam, and grease-laden vapors at the source. The best choice states to operate the exhaust whenever the cooking equipment is turned on, covering start-up, active cooking, and any short preheat or warm-up periods. This ensures contaminants aren’t allowed to accumulate in the hood and duct, which reduces fire risk and improves air quality and visibility.

Running the exhaust only during the active cooking phase misses emissions that occur during preheating or cooldown. Running it all the time wastes energy and can cause unnecessary wear when no cooking is occurring. The option that implies an automatic start with the equipment (and only if exhaust is required) is redundant; the key idea is to align operation with the state of the cooking equipment.