Which component most directly introduces AFFF into the system from a remote supply?

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

Answer: (B)

Introducing AFFF into the firefighting water stream from a remote supply is done most directly by the inline eductor. It sits in the water line and uses the Venturi effect to create suction as water flows past it, drawing foam concentrate from the remote supply through the concentrate line and mixing it into the water stream. The resulting foam solution then travels onward to the foam nozzle. The concentrate storage tank simply holds the concentrate, not mix it by itself, and the foam concentrate line serves to carry the concentrate to the eductor. The foam nozzle just outputs the already-mixed foam. So the eductor is the component that directly introduces AFFF into the system from a remote source.