Basic Firefighter Written Practice Exam

Which feature of CAFS enhances its effectiveness in fire suppression?

1. Increases water volume

2. Creates less surface area

3. Reduces surface tension

4. Requires higher pressure

The correct answer is: Reduces surface tension

The effectiveness of Compressed Air Foam Systems (CAFS) in fire suppression is significantly enhanced by its ability to reduce surface tension. By lowering the surface tension of water, CAFS allows the water to spread and penetrate more effectively into materials that are burning, such as fabrics, wood, and other combustible substances. This enhanced penetration leads to better cooling of the fire and more effective extinguishment because the foam can more easily saturate the fuels involved. In addition to this, the foam produced by CAFS adheres better to vertical surfaces and enhances the coverage of the area by creating a blanket over the fire, which helps suppress flames and smother the fire in a more efficient manner. This property is crucial in fast-paced fire situations where time and precision in suppression techniques are of the utmost importance.