The eductor will be stamped with the rated ____ and ____. Which pairing is correct?

The eductor will be stamped with the rated ____ and ____. Which pairing is correct?

• A. GPM and LPM
• B. PSI and LPM
• C. PSI and CFM
• D. PSI and GPM

Answer: (D)

Eductor performance is determined by the relationship between the nozzle pressure and the water it can deliver. The rating stamped on an eductor tells you the nozzle pressure (in pounds per square inch) required to produce a known flow (in gallons per minute). This pairing—PSI and GPM—lets you quickly judge how much water you’ll get at a given supply pressure, which is essential for planning the attack line and matching pump output to the eductor’s capability. Other units like liters per minute or cubic feet per minute aren’t the standard stamping on eductors in typical firefighting practice, so they don’t convey the practical, real-world relationship used during operations.

Eductor performance is determined by the relationship between the nozzle pressure and the water it can deliver. The rating stamped on an eductor tells you the nozzle pressure (in pounds per square inch) required to produce a known flow (in gallons per minute). This pairing—PSI and GPM—lets you quickly judge how much water you’ll get at a given supply pressure, which is essential for planning the attack line and matching pump output to the eductor’s capability. Other units like liters per minute or cubic feet per minute aren’t the standard stamping on eductors in typical firefighting practice, so they don’t convey the practical, real-world relationship used during operations.