18-29-906 Fixture Vents.

18-29-906.1 Distance of trap from 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.

Table 18-29-906.1
Maximum Distance of Fixture Trap from Vent

 

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)

18-29-906.2 Venting of fixture drains.

   The vent for a fixture drain, except where serving a fixture with integral taps, such as water closets, shall connect above the weir of the fixture trap being vented.

18-29-906.3 Crown vent.

   A vent shall not be installed within two pipe diameters of the trap weir.

18-29-907 Individual Vent.

18-29-907.1 Individual vent permitted.

   Each trap and trapped fixture is permitted to be provided with an individual vent. The individual vent shall connect to the fixture drain of the trap or trapped fixture being vented.

18-29-908 Common Vent.

18-29-908.1 Individual vent as common vent.

   An individual vent is permitted to vent two traps or trapped fixtures as a common vent. The traps or trapped fixtures being common vented shall be located on the same floor level.

18-29-908.2 Connection at the same level.

   Where the fixture drains being common vented connect at the same level, the vent connection shall be at the interconnection of the fixture drains.