Different fire classes require specific types of fire extinguishers to control fires safely and effectively. Class A fires, involving solid materials such as wood, paper, and cloth, can be extinguished using water, foam, or ABC dry chemical powder extinguishers. Class B fires, involving flammable liquids such as petrol, diesel, and paint, require foam, CO₂, or dry chemical powder extinguishers. Class C fires, involving flammable gases, generally require dry chemical powder extinguishers, along with shutting off the gas supply when safe. Class D fires, caused by combustible metals such as magnesium and sodium, require special Class D dry powder extinguishers designed for metal fires.

For electrical fires, CO₂ or suitable non-conductive dry chemical powder extinguishers can be used, provided the equipment is appropriate for the specific electrical hazard. Class F fires (called Class K in the US), involving cooking oils and fats, require wet chemical extinguishers. Never use water on burning oil, flammable liquids, or energised electrical equipment, as it can spread the fire or cause electric shock. Always check the extinguisher label, follow local fire safety standards, and ensure staff receive proper training to select and operate the correct extinguisher.