A standard unit used by plumbers to calculate how much drain capacity each type of plumbing fixture needs.
A unit of measure that represents the hydraulic load imposed by plumbing fixtures on a drainage or supply system, used to size pipes. Each fixture type is assigned a fixture unit value based on its flow rate and frequency of use. The International Plumbing Code provides fixture unit tables for sizing drain lines and supply systems.
The plumbing engineer calculated 87 drainage fixture units for the restaurant, requiring a 4-inch building drain.
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