What type of extinguishing agent is typically used in Class K extinguishers for kitchen fires?

• A. Wet chemical agent
• B. Dry chemical powder
• C. CO2
• D. Dry water

Answer: (A)

Fires involving cooking fats and oils require an extinguishing agent that blankets the surface and chemically neutralizes the fat to prevent reignition. The wet chemical agent used in Class K extinguishers, typically potassium acetate, saponifies fats, turning the oil into a soapy layer that cools, separates the fat from heat, and smothers the flame. This targeted action makes it the most effective and recommended choice for kitchen fires. Dry chemical powder can suppress flames but leaves residue that can foul cooking equipment and doesn’t cool the oil as well. CO2 displaces oxygen but offers limited cooling and can spread burning oil, increasing risk. Dry water is not a standard, widely adopted kitchen extinguisher agent and isn’t ideal for hot oil fires.