Which agent is primarily used in CAFS to enhance extinguishing capability?

• A. Dry chemical
• B. Foam concentrate
• C. Water only
• D. Carbon dioxide

Answer: (B)

In Compressed Air Foam Systems (CAFS), foam concentrate plays a crucial role in enhancing extinguishing capabilities. The foam concentrate, when mixed with water, creates a foam that can effectively smother fires, suppress the release of flammable vapors, and cool the surrounding area. This is particularly important in aviation environments, where flammable materials are often present.

The use of foam concentrate in CAFS allows for the formation of a stable foam blanket that adheres to surfaces and provides a longer-lasting effect than water alone. This makes it especially effective for tackling class B fires, such as those involving flammable liquids that are prevalent in airports. The air introduced during the compression process further enhances the foam's properties, increasing its insulation and coverage capabilities.

While dry chemical agents, water, and carbon dioxide are also effective for extinguishing certain types of fires, they do not provide the same level of effectiveness in terms of lasting coverage and vapor suppression that foam does in CAFS applications. Hence, foam concentrate is the agent primarily used to enhance the extinguishing capacity of CAFS in fire suppression activities.