What type of fire class do extinguishers that use foam address?

Foam fire extinguishers are specifically designed to combat Class B fires, which involve flammable liquids such as oils, gasoline, and paints. The foam creates a barrier between the fuel and the oxygen in the atmosphere, effectively smothering the fire and preventing re-ignition. This capability makes foam extinguishers particularly effective for situations where flammable liquids are present, as they can both cool the burning material and prevent the fire from spreading.

In contrast, Class A fires, involving ordinary combustibles like wood and paper, are managed by different types of extinguishers. Class C fires, which involve electrical equipment, and Class D fires, associated with combustible metals, also require specialized extinguishing agents that are not foam-based. Therefore, foam extinguishers are essential tools for addressing Class B hazards effectively and safely.