Florida Fire State Practice Exam 2025 - Free Firefighter State Exam Practice Questions and Study Guide

In a CAFS (Compressed Air Foam System), the air is compressed at the pump. This system is designed to mix air and water with foam concentrate to create a foam that can effectively smother fires. The compression of air happens as part of the pumping process, where air is added to the water and foam concentrate mixture, enhancing its properties for firefighting.

Furthermore, the proper functioning of a CAFS relies on the ability to inject and mix compressed air effectively with the foam solution before it reaches the nozzle. This process increases the foam's expansion ratio and stability, making it more effective for fire suppression.

The other choices do not accurately describe where air compression occurs in the system. Air is not compressed in the tank, hoses, or nozzles; those components are involved in storing, transporting, and delivering the foam, respectively, rather than creating the compressed air needed for effective foam generation.