NFPA 96 requires which conditions to prevent interference with exhaust airflow?

• A. Unobstructed access and clean, unobstructed ducts
• B. Regular maintenance is optional
• C. Keep air ducts sealed to prevent airflow
• D. Use only fans without access checks

Answer: (D)

Keeping the exhaust system able to move air freely is the main idea. NFPA 96 requires that the pathway for exhaust be readily accessible and kept clean so grease, dirt, and debris can’t reduce airflow. Unobstructed access means technicians can reach hoods, fans, and ducts for inspection and cleaning, while clean, unobstructed ducts ensure there’s no buildup that would slow or block the exhaust. Regular, thorough maintenance is essential here because without cleaning and access, grease can accumulate and airflow can be impeded, creating both a fire risk and poor ventilation.

Options suggesting maintenance is optional, sealing ducts to prevent airflow, or using fans without any access checks conflict with how the system actually works. Sealing or blocking access defeats the purpose of being able to inspect and clean, and relying on fans alone without routine checks ignores the need to keep the entire airflow path clear and functioning properly.