The flow rate, that's how much stuff is being produced, is measured in gallons per minute (GPM) for water and current or amps (A) for electricity.

Flow from 2à‚½-inch and four-inch hydrant outlets from single hydrant simultaneously: 2,348 gpm. Flow from four-inch hydrant outlets from two hydrants simultaneously: 3,216 gpm.

100% involvement = 400 gpm 50% involvement = 200 gpm 25% involvement = 100 gpm The formula indicates that if the dwelling were fully involved, it would require 400 gpm to effectively control the fire.

The Cummins QSF6X6 is designed for moderate flow rates up to 2,600 gpm, while the QSF4X4 supports flow rates up to 1,350 gpm.

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