Which class of fire extinguisher should be used for a deep-fryer fire after turning off the power?

The appropriate class of fire extinguisher for a deep-fryer fire is Class K. This class is specifically designed for fires involving cooking oils and fats, which are common in commercial kitchen settings where deep fryers are used.

Class K extinguishers utilize special extinguishing agents that are effective in cooling and suppressing these types of fires to prevent re-ignition. These extinguishers are essential in environments where high-temperature cooking oils are used, as standard extinguishers may not adequately address the specific hazards associated with these fires.

In contrast, other fire classes do not address the unique nature of kitchen fires involving fats and oils. Class A extinguishers are meant for ordinary combustibles like wood and paper. Class B extinguishers are effective against flammable liquids but are not specifically tailored for cooking oils. Class C extinguishers are suitable for electrical fires and do not address the issue of burning oils directly. Therefore, a Class K extinguisher is the best choice for safely extinguishing a deep-fryer fire.