Class B fires primarily involve which of the following?

Class B fires primarily involve flammable liquids, gases, and solids that produce flammable vapors. This category includes substances such as gasoline, oil, grease, and paints. It is important to recognize this classification as it determines the type of extinguishing agents that should be used to effectively combat the fire. For instance, water is not effective for Class B fires because it can spread the flammable liquid, making the situation worse.

In terms of fire classification, Class A fires involve common combustibles like paper and wood, while Class C fires pertain to electrical appliances. Therefore, understanding the nature of Class B fires helps in selecting the appropriate fire suppression method, which is crucial for safety and effective fire management.