Which class is used for flammable and combustible liquids?

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Fires involving flammable and combustible liquids are addressed with Class B extinguishers. These liquids—gasoline, kerosene, mineral spirits, solvents, oils, and similar fuels—form a surface that can feed the flame if air keeps reaching it. Extinguishing agents for Class B are designed to smother or separate the fuel from the air, or to interrupt the chemical reaction at the flame. Foam blankets the liquid surface, CO2 displaces oxygen, and dry chemical can disrupt the flame chemistry. Water-based extinguishers are not suitable because they can spread the liquid and spread the fire. In kitchens, cooking oils fall under a different category (Class K), but for most flammable liquid fires, Class B is the correct focus.