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Fixture Unit Sizing (MVP)

How fixture units work

Sum hot/cold fixture units to estimate service flow and pipe sizing baseline.

1

List fixtures

Lav, WC, shower, etc.

2

Apply FU factors

Cold and hot fixture units

3

Estimate service flow

Convert FU to gpm (proxy)

4

Export summary

Provide to plumbing designer

Summary

Cold FU

24

Hot FU

14

Total FU

38

Service Flow

29 gpm

Fixtures

Lavatory

1 FU cold

1 FU hot

6 qty

12 FU

Water Closet (tank)

2.5 FU cold

0 FU hot

4 qty

10 FU

Shower

2 FU cold

2 FU hot

4 qty

16 FU

Lighting Designer | VibeLux