In the sequence described for foam usage, foam should be introduced into the line by:

• A. Inducted into the line
• B. Injected directly into the water stream
• C. Added at the pump
• D. Dripped into the line

Answer: (A)

Foam must be introduced into the line by induction through a foam proportioner. This method uses a venturi effect to draw the foam concentrate into the moving water so the two mix evenly and at the correct ratio before reaching the nozzle. Induction provides consistent foam quality across different flow rates and ensures the concentrate isn’t left to pool or misproportion, which can happen if you inject directly into the water stream, add at the pump, or drip into the line. By pulling the concentrate into the line, you get a reliable, uniform foam solution ready for application.