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The minimum size of a combination drain and vent pipe shall be in accordance with Table 18-29-912.3.
Diameter Pipe (inches) | Maximum Number of Drainage Fixture Units | |
Connecting to a horizontal branch or stack | Connecting to a building drain or building subdrain | |
Diameter Pipe (inches) | Maximum Number of Drainage Fixture Units | |
Connecting to a horizontal branch or stack | Connecting to a building drain or building subdrain | |
2 | 3 | 4 |
2 1/2 | 6 | 26 |
3 | 12 | 31 |
4 | 20 | 50 |
5 | 160 | 250 |
6 | 360 | 575 |
For SI: 1 inch = 25.4 mm.
Island fixture venting shall not be permitted for fixtures other than sinks and lavatories. Residential kitchen sinks with a dishwasher waste connection, a food waste grinder, or both, in combination with the kitchen sink waste, shall be permitted to be vented in accordance with this section.
The island fixture vent shall connect to the fixture drain as required for an individual or common vent. The vent shall rise 6 inches (150 mm) vertically above the flood rim level of the fixture being vented before offsetting horizontally or vertically downward before connecting to the outside vent terminal.
The vent located below the flood level rim of the fixture being vented shall be installed as required for drainage piping in accordance with Article 7, except for sizing. The vent shall be sized in accordance with Section 18-29-916.2. The lowest point of the island fixture vent shall connect full size to the drainage system. The connection shall be to a vertical drain pipe or to the top half of a horizontal drain pipe. Clean-outs shall be provided in the island fixture vent to permit rodding of all vent piping located below the flood level rim of the fixtures. Rodding in both directions shall be permitted through a clean-out.
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