Foam agents are primarily used for which class of fires?

Foam agents are primarily utilized for Class B fires, which involve flammable liquids such as gasoline, oil, and solvents. These agents work by creating a barrier that suppresses vapors and prevents re-ignition, making them particularly effective for these types of fires. In addition, foam can provide some benefit for Class A fires, which include ordinary combustibles like wood, paper, and textiles, by cooling the material and providing a layer of water or moisture to suppress flames.

In this context, utilizing foam agents for both Class A and Class B fires highlights their versatility. While foam is predominantly associated with Class B, its application can extend to Class A under certain circumstances, particularly when the goal is to cool burning materials or protect structures from fire spread. This dual capability makes foam agents useful in a wider range of fire suppression scenarios, which justifies the selection of both classes as relevant for foam use.