How are fire extinguishers classified?

Fire extinguishers are classified based on the types of fires they are designed to combat, which is a critical aspect of ensuring effective fire suppression. Different types of fires—such as those involving ordinary combustibles, flammable liquids, electrical equipment, or metal fires—require different extinguishing agents to be effective. For example, water extinguishers are suitable for class A fires (ordinary combustibles), while foam or dry chemical extinguishers are needed for class B (flammable liquids) and class C (electrical equipment) fires. This system of classification allows users to select the appropriate extinguisher for the specific fire hazards they might encounter, which is crucial for both safety and effectiveness.

In contrast, although color coding is relevant for identifying the type of extinguisher quickly, it is not a classification method. Manufacturer and model details pertain to the specific design and production of extinguishers, which do not relate to their fire-fighting capabilities. Finally, size and weight, while important for considerations such as portability and storage, do not determine the type of fire hazard the extinguisher is designed to address. The focus on fire types directly informs users about the effectiveness of extinguishers in real-life situations, making it a key factor