Wet chemical systems protect fire hazards in which parts of a commercial cooking exhaust system?

• A. Hoods, plenum, ducts, and associated cooking appliances
• B. Storage rooms
• C. Restrooms
• D. Open areas

Answer: (A)

Wet chemical systems are built to address fires that involve cooking oils and fats in the grease-laden portions of a commercial kitchen’s exhaust. They are designed to protect the components that handle these vapors and flames—specifically the hood, the plenum, the ducts, and the cooking appliances themselves. The wet chemical agent is released into these areas, coating interior surfaces and reacting with fats to form a soapy layer that saponifies oils and helps prevent the fire from spreading or reigniting. This targeted protection is why the system covers hoods, plenums, ducts, and associated cooking equipment, rather than spaces like storage rooms, restrooms, or open areas, which are not part of the grease-laden exhaust pathway.