Which type of fire extinguisher would be most appropriate for fires caused by cooking oils?

The most appropriate type of fire extinguisher for fires caused by cooking oils is the Class K fire extinguisher. Class K extinguishers are specifically designed to combat fires involving cooking oils and fats, which are often associated with commercial kitchens and deep-frying situations.

These fires can burn at very high temperatures and have unique characteristics that require special suppression agents. Class K extinguishers contain a wet chemical agent that effectively cools the fire and also forms a soapy layer on the surface of the burning oil, which helps to smother the flames and prevent re-ignition.

In contrast, other classes of extinguishers may not be effective or safe to use on cooking oil fires. For example, a Class B extinguisher is aimed at flammable liquids but might not adequately address the challenges posed by cooking oils. Similarly, a Class C extinguisher is intended for electrical fires and does not address the specific needs of cooking oil fires. Class A extinguishers are suitable for ordinary combustibles like wood and paper but are ineffective on cooking oil fires. Thus, Class K is the designated option that specifically targets cooking oil and fat fires safely and effectively.