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Where the drainage piping has been roughed-in for future fixtures, a rough-in connection for a vent shall be installed a minimum of one-half the diameter of the drain, but not less than the minimum size indicated in Table 18-29-916.1. The vent rough-in shall connect to the vent system. The connection shall be identified to indicate that the connection is a vent.
Each fixture trap shall have a protecting vent located so that the slope and the developed length in the fixture drain from the trap weir to the vent fitting are within the requirements set forth in Table 18-29-906.1.
Exception: The developed length of the fixture drain from the trap weir to the vent fitting for self-siphoning fixtures, such as water closets, shall not be limited.
Size of Trap (inches) | Size of Fixture Drain (inches) | Slope (inch per foot) | Distance from Trap (feet) |
1 1/4 | 1 1/2 | 1/4 | 5 |
1 1/2 | 1 1/2 | 1/4 | 5 |
1 1/2 | 2 | 1/4 | 5 |
2 | 2 | 1/4 | 5 |
3 | 3 | 1/8 | 5 |
4 | 4 | 1/8 | 5 |
(Amend Coun. J. 10-14-21, p. 37722, Art. IX, § 4)
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