What method is used to extinguish a Class B fire?

The correct approach to extinguishing a Class B fire, which involves flammable liquids such as gasoline, oil, and solvents, is through the use of dry chemical agents. Dry chemical fire extinguishers work by interrupting the chemical reaction occurring in the fire and providing a barrier between the fuel and the oxygen in the air. This method is particularly effective for Class B fires because it rapidly suppresses the flames and prevents re-ignition.

Using water to extinguish a Class B fire is unsafe, as it can spread the flammable liquid and exacerbate the fire. Carbon dioxide is also effective in certain scenarios, particularly in enclosed spaces, but dry chemical agents are generally considered more reliable for quickly extinguishing Class B fires in various environments. While an ABC fire extinguisher can be used for Class B fires since it contains dry chemical agents, the focus here is on the dry chemical method specifically, which underscores its effectiveness for these types of fires.