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Total Fixture Units

15.5 WSFU

Estimated Peak Demand19.7 GPM

Total Fixture Units vs Toilets (Flush Valve)

Formel anzeigen →

Formel

## Fixture Unit Method Each plumbing fixture is assigned a unit value based on its flow demand. The total WSFU determines minimum pipe size per code tables. A quick estimate for peak demand in GPM uses the Hunter curve approximation: **GPM = 5 x sqrt(WSFU)**.

Lösungsbeispiel

2 toilets, 3 sinks, 2 showers, 1 dishwasher, 1 washer.

  1. 01Toilets: 2 x 2.5 = 5
  2. 02Sinks: 3 x 1 = 3
  3. 03Showers: 2 x 2 = 4
  4. 04Dishwasher: 1 x 1.5 = 1.5
  5. 05Washer: 1 x 2 = 2
  6. 06Total = 15.5 WSFU
  7. 07Peak GPM = 5 x sqrt(15.5) = 19.7 GPM