Fixture-Unit Requirements on Trap Sizes
Trap size and no. fixture units
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The maximum number of fixture-units and trap sizes in drainage systems can be estimated with the table below.
| No. of Fixture Units | Trap Size (in) |
| 1 | 1 1/4 |
| 2 - 3 | 1 1/2 |
| 3 - 4 | 2 |
| 5 - 6 | 3 |
| 6 - 8 | 4 |
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