What is the difference between Class A and Class B fire extinguishers?

The distinction between Class A and Class B fire extinguishers is crucial for effectively addressing different types of fire hazards. Class A fire extinguishers are designed specifically for fires involving ordinary combustibles such as wood, paper, cloth, and some plastics. These materials typically burn easily and leave ash when they combust.

On the other hand, Class B fire extinguishers are intended for flammable liquids and gases, including substances like gasoline, oil, paint, and solvents. These types of fires usually require different extinguishing agents because using water (common in Class A extinguishers) on flammable liquid fires can cause the fire to spread.

Therefore, Class B extinguishers are formulated with agents that can suffocate or chemically interrupt the combustion process in flammable liquids, making them indispensable for handling these specific fire scenarios effectively. This distinction ensures that responders use the proper extinguisher for the type of fire they are encountering, thereby increasing safety and mitigating fire-related risks.