What is the primary function of a fire extinguisher labeled "Class B"?

The primary function of a fire extinguisher labeled "Class B" is to extinguish flammable liquid fires. Class B fires involve flammable liquids such as gasoline, oil, paints, and solvents, which can rapidly spread and pose significant hazards. Class B fire extinguishers contain agents specifically designed to smother or inhibit the combustion process of these types of fires, effectively suffocating the flames and preventing re-ignition.

Understanding the classifications of fire extinguishers is crucial for safety and effectiveness in emergency situations. For instance, Class A extinguishers are designed for fires involving ordinary combustibles like wood and paper, Class C extinguishers are suited for electrical fires, and Class D extinguishers are meant for fires involving combustible metals. Each class is tailored to handle specific types of materials, highlighting the importance of selecting the appropriate extinguisher based on the nature of the fire to ensure successful firefighting efforts.