How can you confirm a Class K extinguisher is appropriate for use on cooking fats and oils?

• A. The extinguisher is red with a white stripe
• B. The label specifies Class K and the appropriate wet chemical agent for cooking fats/oils
• C. The extinguisher is lightweight
• D. The extinguisher has a CO2 face

Answer: (B)

To confirm an extinguisher is appropriate for cooking fats and oils, check the label on the unit (or its service tag). It must explicitly say Class K and indicate a wet chemical agent designed for grease fires. That labeling shows the extinguisher is specifically formulated for kitchens and fats/oils fires, using the wet chemical action (potassium acetate) that saponifies fats to form a soapy layer, cooling and smothering the fire. Other features like color, weight, or having CO2 do not guarantee suitability for grease fires.