Which class is used for cooking oils?

• A. Class K
• B. Class A
• C. Class B
• D. Class C

Answer: (A)

Cooking oil fires involve fats and oils that burn hot and can react badly with water. The appropriate fire class for these fires is Class K. Extinguishers labeled Class K are designed for commercial kitchens and release a wet chemical agent that saponifies fats, turning them into a soapy layer that cools and smothers the oil, helping prevent reignition. This approach is specifically tailored to cooking media, unlike Class A for ordinary combustibles (wood, paper), Class B for flammable liquids (gasoline, solvents), or Class C for electrical fires. So Class K is the best choice for fires involving cooking oils.