Which extinguishing system is specifically designed for commercial cooking equipment?

• A. Water-Based Sprinkler
• B. Dry Chemical
• C. Foam
• D. Wet Chemical (Class K)

Answer: (D)

Extinguishing systems designed for commercial kitchens are built to handle fires involving cooking fats and oils. The wet chemical system (Class K) is specifically designed for this environment. It releases a wet chemical agent, typically potassium acetate, that saponifies fats in the oil fires to form a soapy, cooling layer. This layer emulsifies the fats and helps prevent re-ignition, while also enabling the agent to work directly where the flames originate—on and around cooking appliances, hoods, and ducts. Other options aren’t tailored for kitchen fats: water-based sprinklers can spread burning oil and are not effective at controlling grease fires; dry chemical systems are general-purpose and leave residues that can damage kitchen equipment and aren’t optimized for cooking fats; foam is better suited for hydrocarbon fires but doesn’t address the unique needs of commercial cooking equipment. For fires in commercial kitchens, the wet chemical system is the best choice.