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703.2 Maximum Number of Fixture Units
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Table 703.2 shows the maximum number of fixture units allowed on a vertical or horizontal drainage pipe, building drain, or building sewer of a given size; the maximum number of fixture units allowed on a branch interval of a given size; and the maximum length (in feet and meters) of a vertical drainage pipe of a given size.
| SIZE OF PIPE (inches) | 11/4 | 11/2 | 2 | 3 | 4 | 5 | 6 | 8 | 10 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Units | ||||||||||
| Drainage Piping1 | ||||||||||
| Vertical | 1 | 22 | 163 | 484 | 256 | 600 | 1380 | 3600 | 5600 | 8400 |
| Horizontal | 1 | 1 | 83 | 354 | 2165 | 4285 | 7205 | 26405 | 46805 | 82005 |
| Maximum Length | ||||||||||
| Drainage Piping | ||||||||||
| Vertical, (feet) | 45 | 65 | 85 | 212 | 300 | 390 | 510 | 750 | — | — |
| Horizontal (unlimited) | ||||||||||
| Vent Piping | ||||||||||
| Horizontal and Vertical6 | ||||||||||
| Maximum Units | 1 | 83 | 24 | 84 | 256 | 600 | 1380 | 3600 | — | — |
| Maximum Lengths, (feet) | 45 | 60 | 120 | 212 | 300 | 390 | 510 | 750 |
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
Notes:
1 Excluding trap arm.
2 Except for sinks, urinals, and dishwashers — exceeding 1 fixture unit.
3 Except for six-unit traps or water closets.
4 Only four water closets or six-unit traps allowed on a vertical pipe or stack, and not to exceed three water closets or six-unit traps on a horizontal branch or drain.
5 Based on 1/4 inch per foot (20.8 mm/m) slope. For 1/8 of an inch per foot (10.4 mm/m) slope, multiply horizontal fixture units by a factor of 0.8.
6 The diameter of an individual vent shall be not less than 11/4 inches (32 mm) nor less than one-half the diameter of the drain to which it is connected. Fixture unit load values for drainage and vent piping shall be computed from Table 702.1 and Table 702.2(2). Not to exceed one-third of the total permitted length of a vent shall be permitted to be installed in a horizontal position. Where vents are increased one pipe size for their entire length, the maximum length limitations specified in this table do not apply. This table is in accordance with the requirements of Section 901.3.
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