How many gallons per minute flow through a pipe or out of a fixture — used to size plumbing and measure water efficiency.
The volume of water or other fluid passing through a pipe or fixture per unit of time, typically expressed in gallons per minute (GPM) or gallons per hour (GPH). Flow rate determines pipe sizing, pressure loss calculations, and fixture performance. Low-flow fixtures are designed to reduce water consumption while maintaining adequate flow.
WaterSense-labeled faucets have a maximum flow rate of 1.5 GPM, compared to 2.2 GPM for standard fixtures.
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