Fire Safety, Extinguishers, And Rescue Techniques Practice Test

Which Class is associated specifically with cooking oils and fats?

Class A Class B Class C Class K

Correct Answer:

Class K

Explanation:

Fires caused by cooking oils and fats are addressed by Class K extinguishers. These are designed for commercial kitchens and use a wet chemical agent (typically potassium acetate) that saponifies fats. That chemical reaction creates a soapy layer on the surface of the oil, cooling it, creating a barrier between the fuel and the air, and helping to prevent reignition. Other classes don’t target these fats in the same way: Class A covers ordinary combustibles like wood and paper, Class B covers flammable liquids, and Class C covers electrical fires. Because oil and fat fires have unique properties and require this specialized approach, Class K is the appropriate choice. It’s also important to avoid water on oil fires, as that can cause splattering and spreading the flames.

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