Is a Class K extinguisher appropriate for all kitchen fires?

• A. Yes, for any kitchen fire
• B. No, Class K cannot be used on fires involving fats and oils
• C. It is specifically designed for cooking fats and oils fires
• D. It only works on electrical fires

Answer: (C)

Class K extinguishers are designed for a very specific kitchen hazard: fires involving cooking fats and oils. The key reason is the wet chemical extinguishing agent, typically potassium acetate, which saponifies fats on contact. This creates a soapy layer that cools the oil and smothers the flame, helping prevent reignition in high-temperature oil fires. Because fats and oils behave differently from other fuels, using water or many other extinguishing agents in oil fires can cause splattering, spread the fire, or dangerous reactions. Class K specifically addresses this hazard, not electrical fires or ordinary combustibles, which require different classes of extinguishers. So it is specifically designed for cooking fats and oils fires.