Which extinguisher is specifically designed for commercial kitchen oil fires (Class K)?

• A. Wet chemical extinguishers
• B. Water-based extinguishers
• C. Foam extinguishers
• D. CO2 extinguishers

Answer: (A)

When fighting commercial kitchen oil fires, you need an extinguisher that can specifically handle fats and oils. Wet chemical extinguishers are designed for this purpose because their active agent (potassium acetate) saponifies fats on contact. This reaction turns the burning oil into a soapy layer that cools the surface and forms a barrier between the fuel and the flame, reducing the chance of reignition and minimizing splatter. The result is a safer, more effective control of deep-fat fires in busy kitchens.

Water-based extinguishers should not be used on oil fires because water can cause the hot oil to splatter and spread the fire. Foam extinguishers can be used on some liquids, but they don’t address the oil at the molecular level and can be overwhelmed by high-temperature cooking oils. CO2 extinguishers displace oxygen and don’t provide the cooling and sealing effect needed for cooking oil fires, making it easier for the fire to reignite once the CO2 dissipates. Wet chemical extinguishers’ specialized action makes them the best fit for commercial kitchen oil fires.