Where does the foam solution exist in the system?

• A. Between the nozzle and the air inlet.
• B. Between the proportioner and the nozzle or aerating device that adds air to create finished foam.
• C. Inside the foam concentrate container.
• D. In the water supply only.

Answer: (B)

The main idea is that foam solution is the liquid created when foam concentrate is metered into the water by the proportioner. That foam solution travels through the hose to the nozzle or aerating device where air is added to produce finished foam. So the foam solution exists between the proportioner and the nozzle or aerating device that creates the foam. It isn’t simply the concentrate container or the water supply alone.