What is the purpose of hood grease filters?

• A. To capture grease from cooking vapors and protect the duct and system from buildup.
• B. To extinguish small fires in the hood.
• C. To absorb heat to reduce ceiling temperature.
• D. To deliver ventilation air to the office space.

Answer: (A)

Hood grease filters are meant to trap grease from cooking vapors so it doesn’t coat the exhaust duct and the rest of the ventilation system. When hot fats and oils are vented, they can condense on surfaces inside the hood and ductwork. If grease builds up, it creates a fuel source for fires, reduces airflow, and makes the system harder to clean and operate efficiently. The filter acts as the first line of defense, catching much of that grease before it enters the duct.

They are not designed to extinguish fires—that function belongs to a fire suppression system or extinguishers. They also don’t absorb heat or deliver air to other spaces; their role is specifically to keep grease out of the ductwork and maintain the performance and safety of the kitchen exhaust system. Regular cleaning of the filters is essential to prevent buildup and keep the system working effectively.