What is the main purpose of using a Type B extinguisher?

The main purpose of using a Type B extinguisher is to suppress and extinguish fires that involve flammable liquids and gases. This includes substances such as gasoline, oil, grease, paint, and solvents, which can ignite and cause dangerous fires that spread rapidly. Type B extinguishers are specifically designed with agents that effectively smother these types of fires, cutting off the oxygen supply and inhibiting combustion.

Flammable liquid fires are particularly hazardous because they can emit dangerous vapors and are often more volatile than solid material fires. Using a Type B extinguisher will often involve techniques to avoid splashing and spreading the flames, underscoring the importance of proper training in their use.

While other options address various aspects of safety in emergency situations, they do not pertain to the specific function of a Type B extinguisher. For example, electrical fires require specially rated extinguishers to avoid electrical hazards, cooling hot surfaces is more related to preventing re-ignition or reducing heat risks rather than extinguishing fires, and providing a warning to evacuate is more about safety protocols rather than the direct act of extinguishing a fire.