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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.
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.
909.3 Crown vent.
A vent shall not be installed within two pipe diameters of the trap weir.
910.1 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 in accordance with Section 909.1, but at a distance not to exceed 16 feet (4876 mm).
910.2 Floor drain vents.
No vents will be required for piping serving floor drains when the floor drain is located not more than 15 feet (4572 mm) from the vented line to which it connects.
911.1 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.
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