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Section P3105 Fixture Vents

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P3105.1 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 limits indicated in Table P3105.1.
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 P3105.1
MAXIMUM DISTANCE OF FIXTURE TRAP FROM VENT
SIZE OF TRAP (inches) SLOPE (inch per foot) DISTANCE FROM TRAP (feet)
11/4 1/4 5
11/2 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.
P3105.2 Fixture Drains
The total fall in a fixture drain resulting from pipe slope shall not exceed one pipe diameter, nor shall the vent pipe connection to a fixture drain, except for water closets, be below the weir of the trap.
P3105.3 Crown Vent Prohibited
A vent shall not be installed within two pipe diameters of the trap weir.

Related Code Sections

Section 909 Vents, Fixture Vents
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 ...
Section P3105 Vents, Fixture Vents
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 ...
Section P3105 Vents, Fixture Vents
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 ...
909.2 Vents, Venting of Fixture Drains
The total fall in a fixture drain due to pipe slope shall not exceed the diameter of the fixture drain, nor shall the vent connection to a fixture ...
909.3 Vents, Crown Vent
A vent shall not be installed within two pipe diameters of the trap weir ...