Florida Fire State Practice Exam

Which system uses an onboard air compressor to enhance air flow before discharge?

1. Water mist system

2. Dry chemical system

3. Compressed Air Foam System (CAFS)

4. Sprinkler system

The correct answer is: Compressed Air Foam System (CAFS)

The Compressed Air Foam System (CAFS) utilizes an onboard air compressor to enhance air flow before the foam is discharged. This system injects compressed air into the foam solution, creating a highly effective firefighting agent that combines the benefits of both water and foam. The compressed air helps to expand the foam, providing increased coverage and improved thermal insulation when applied to fires. The unique design of CAFS allows for better penetration and wrapping around surfaces, which is particularly advantageous for extinguishing Class B (flammable liquid) fires or as a preemptive measure against potential fire spread. By producing a lightweight foam with a higher volume, CAFS enhances the effectiveness of water and reduces water damage during firefighting operations. In contrast, other systems mentioned do not employ an onboard air compressor in the same manner. Water mist systems primarily use water droplets to cool and displace combustible gases, while dry chemical systems discharge powdered agents for extinguishment without the enhancement provided by compressed air. Sprinkler systems rely solely on gravity feed and water pressure to release water, lacking the air compression element entirely.