Gallons per minute or liters per minute refers to the amount of water used by flow fixtures in LEED. Flow fixtures are fixtures that deliver a constant stream of water, such as faucets, showerheads, or hose bibs. The flow rate of these fixtures is measured in gallons per minute (gpm) or liters per minute (L/min), which indicates how much water flows through them in a given time period. The LEED Green Associate Candidate Handbook states that one of the strategies for achieving water efficiency is to “use low-flow faucets and showerheads (maximum 2.5 gpm at 80 psi)” [1, p. 14]. References: LEED Green Associate Candidate Handbook, [Water Efficiency | U.S. Department of Energy]
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