Which item is not a component of a Compressed Air Foam System (CAFS) as described?

• A. Water pump
• B. Foam proportioning system
• C. Air compressor
• D. Portable generator

Answer: (D)

The main idea here is what components make up a Compressed Air Foam System and what doesn’t. A CAFS uses three core parts: a water pump to supply pressurized water, a foam proportioning system to meter foam concentrate into the water stream, and an air compressor to inject air and create the foam blanket. These elements are what enable the foam to be produced and delivered effectively.

A portable generator is not a built-in part of the CAFS itself. It may power pumps or equipment in some setups, but it’s not a active component that participates in generating or delivering the foam. So, the item that isn’t a component of CAFS as described is the portable generator.