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What is a fixture unit for plumbing?
Wednesday, June 20, 2018
It is a unit of measure used to evaluate the demand that a particular plumbing fixture, or group of fixtures, will put on the plumbing system. It is used in conjunction with other factors, and there are fixture units assigned for both water supply and drainage. The fixture unit rating takes into account the likely volume of flow, average duration of use, and expected frequency of use. Here’s how the Residential Edition of the Florida Building Code (FBC) and the International Residential Code (IRC) define them:
A full bathroom, for example, is rated at 3.6 w.s.f.u. (water supply fixture units), while a clothes washer is given a 1.4. Only fixtures that dispense water have fixture unit ratings so, although fixture units are used to calculate the size pipe serving a water heater, the water heater itself is not assigned a fixture unit value.
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