Section PC 909: Fixture Vents

909.1 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 909.1.

   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 909.1
Maximum Distance of Fixture Trap from Vent

 

Size of Trap (inches)	Slope (inch per foot)	Distance from Trap (feet)
1 1/4	1/4	5
1 1/2	1/4	6
2	1/4	8
3	1/8	12
4	1/8	16

 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 inch per foot = 83.3 mm/m.

909.2 Venting of fixture drains.

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