What labeling is mandatory on all portable fire extinguishers?

The mandatory labeling on all portable fire extinguishers includes class ratings along with the appropriate letters and symbols. This labeling is crucial because it informs users about the types of fires that the extinguisher is effective against, which is essential for selecting the right extinguisher in an emergency situation. For instance, different classes of fires (such as Class A for ordinary combustibles, Class B for flammable liquids, and Class C for electrical fires) require different types of extinguishing agents. The presence of recognizable symbols and letters on the extinguisher allows for quick identification, enabling users to act swiftly and safely when faced with a fire. This labeling adheres to established safety standards and ensures that extinguishers are easily understood and correctly utilized by trained personnel and the general public alike.