// CODE SNIPPET
C 304.3 Size of Horizontal Branch or Vertical Stack
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The maximum number of drainage fixture units allowed on a horizontal branch or vertical soil or waste stack of a given size shall be in accordance with Table C 304.3. Stacks shall be sized based on the total accumulated connected load at each story or branch interval.
| DIAMETER OF PIPE (inches) | MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS | |||
|---|---|---|---|---|
| HORIZONTAL FIXTURE BRANCH1 | ONE STACK OF THREE OR FEWER BRANCH INTERVALS | STACKS WITH MORE THAN THREE BRANCH INTERVALS | ||
| TOTAL FOR STACK | TOTAL AT ONE BRANCH INTERVAL | |||
| 11/2 | 3 | 4 | 8 | 2 |
| 2 | 6 | 10 | 24 | 6 |
| 21/2 | 12 | 20 | 42 | 9 |
| 3 | 202 | 482 | 722 | 202 |
| 4 | 160 | 240 | 500 | 90 |
| 5 | 360 | 540 | 1100 | 200 |
| 6 | 620 | 960 | 1900 | 350 |
| 8 | 1400 | 2200 | 3600 | 600 |
| 10 | 2500 | 3800 | 5600 | 1000 |
| 12 | 3900 | 6000 | 8400 | 1500 |
| 15 | 7000 | 6000 | 8400 | 1500 |
For SI units: 1 inch = 25 mm
Notes:
1 Does not include branches of the building drain.
2 A maximum of two water closets or bathroom groups within each branch interval or more than six water closets or bathroom groups on the stack.
Horizontal stack offsets shall be sized in accordance with Table C 304.2 as required for building drains.
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