What is the primary purpose of a foam proportioner in firefighting operations?

• A. To heat water
• B. To store foam concentrate
• C. To reduce the color of foam
• D. To mix foam concentrate with water to form foam solution

Answer: (D)

The main idea is that a foam proportioner blends foam concentrate into the water stream at a controlled ratio to create a foam solution. This foam solution is what forms the foam blanket used to cover and suppress the fire, cooling the fuel and separating the fuel from the air. Heating water, storing concentrate, or altering foam color aren’t the functions of a proportioner, but rather aspects of other parts of the foam system. The essential purpose is to produce the proper foam solution by mixing concentrate with water.