🔍 Key Concepts

• Portable in-line foam proportioner operation and what it actually does in the hose line • Difference between a mechanical foam nozzle and a standard/all-purpose fire nozzle • Why foam needs air aspiration and gentle application to form and stay on the liquid surface

💭 Think About

• Think about which device is specifically designed to mix foam solution with air and discharge it as finished foam, not just as water/solution. • Ask yourself: does this option create and shape a foam blanket, or is it mainly for plain water stream or fog? • Consider which device fire-fighting manuals pair with an in-line proportioner for fuel and flammable liquid fires.

✅ Before You Answer

• Verify which choice is explicitly described as a foam-making nozzle rather than a general-purpose water nozzle. • Check which device is designed to provide air aspiration to the foam solution coming from the proportioner. • Eliminate any option that is normally used only for plain water streams or standard fog/straight stream operations without foam.