Which device introduces AFFF into the water stream from an external supply?

Which device introduces AFFF into the water stream from an external supply?

• A. AFFF concentrate storage tank
• B. Foam nozzle assembly
• C. AFFF In-line eductor
• D. Portable foam mixer

Answer: (C)

The device that introduces AFFF into the water stream from an external supply uses the Venturi effect to draw concentrate into the flowing water. An inline eductor sits in the water line and, as water passes through, creates suction that pulls AFFF concentrate from an external storage source into the stream. The mixture then travels downstream to be discharged as foam through the foam nozzle. The other options don’t perform this function by themselves. AFFF concentrate storage tank simply holds the concentrate; it doesn’t inject it into water. A foam nozzle assembly shapes and discharges foam but relies on an eductor or another means to introduce concentrate from an external supply. A portable foam mixer is for small, manual applications and isn’t part of a fixed external-supply eduction system.

The device that introduces AFFF into the water stream from an external supply uses the Venturi effect to draw concentrate into the flowing water. An inline eductor sits in the water line and, as water passes through, creates suction that pulls AFFF concentrate from an external storage source into the stream. The mixture then travels downstream to be discharged as foam through the foam nozzle.

The other options don’t perform this function by themselves. AFFF concentrate storage tank simply holds the concentrate; it doesn’t inject it into water. A foam nozzle assembly shapes and discharges foam but relies on an eductor or another means to introduce concentrate from an external supply. A portable foam mixer is for small, manual applications and isn’t part of a fixed external-supply eduction system.