In kitchen fire suppression, which extinguisher is preferred when a Class K agent is available?

• A. Specifically designed for commercial kitchens and effective on cooking oil fires.
• B. Used for electrical fires.
• C. Used to cool large structural fires.
• D. Used for ordinary combustibles.

Answer: (C)

Fats and cooking oils create fires that behave differently from other fuels, so you choose an extinguisher that is specifically designed to handle that fuel type. Class K extinguishing agents are formulated to work on cooking oil fires by saponifying the fats and forming a soapy layer that cools the surface, seals the oil, and helps prevent reflash. That’s why the extinguisher described as specifically designed for commercial kitchens and effective on cooking oil fires is the best choice when a Class K agent is available. It directly addresses the unique hazards of kitchen fires, providing effective control without the risks oil fires pose to other types of extinguishing methods.

Other extinguishers are suited to different fire types: one for electrical fires isn’t appropriate for cooking oils, a large-structural-fire extinguisher focuses on cooling and suppressing a wide area (and isn’t optimized for oil fires), and an extinguisher for ordinary combustibles isn’t effective against fats and oils.