What type of fire extinguisher would be suitable for a Class B fire?

A foam extinguisher is suitable for Class B fires primarily because it is designed to combat fires involving flammable liquids, such as oil and gasoline. Class B fires typically consist of combustible liquids, which can be effectively smothered by the foam. The foam creates a barrier that prevents oxygen from reaching the fuel, thereby extinguishing the flames. Additionally, the foam can help to cool the area around the fire, reducing the risk of re-ignition.

In situations involving combustible liquids, using a water extinguisher would be dangerous, as water can spread the flames rather than extinguish them. Dust extinguishers are specialized for certain types of fires but are not as commonly suitable for Class B fires. Dry chemical extinguishers also work effectively on Class B fires, but foam extinguishers provide a unique advantage in smothering and cooling. Thus, the foam extinguisher stands out for its specific application in these scenarios.