What does a Compressed Air Foam System (CAFS) utilize to create effective foam?

• A. Water and dry chemical
• B. Water and air pressure
• C. Foam concentrate and air pressure
• D. A mix of water, foam concentrate, and air pressure

Answer: (D)

A Compressed Air Foam System (CAFS) effectively utilizes a mixture of water, foam concentrate, and air pressure to create the foam used for firefighting. This method allows for the production of a highly effective firefighting agent that enhances coverage, reduces water usage, and improves the insulation properties of the foam.

The combination of water and foam concentrate creates a solution that, when mixed with compressed air, generates a foam that is lighter and more stable than traditional foam. By incorporating air into the mixture, CAFS creates a foam that not only adheres better to surfaces but also provides better performance on Class B fires involving flammable liquids, as it can blanket the fuel, suppress vapors, and prevent re-ignition.

The inclusion of air pressure is critical because it assists in expanding the foam, creating a larger volume that can cover more area, allowing for more efficient firefighting operations. This system's design is specifically intended to optimize the firefighting process by delivering a highly effective foam with reduced water consumption, which can be especially beneficial in scenarios where water supply may be limited or where environmental impact is a concern.