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Section P-1110 Size, Length and Number of Vents and Fresh Air Inlets
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P-1110.1 Length of Vents
The length of a vent shall be its developed length from the lowest connection of the vent with the soil stack, waste stack, or house drain to the vent terminal above the roof.
P-1110.2 Size of Stack Vent
The diameter of a stack vent shall not be less than the diameter of the soil or waste stack of which it is an extension.
P-1110.3 Size of Vent Stacks
A vent stack or main vent connecting relief vents, circuit vents, or loop vents shall have a diameter of at least one-half the diameter of the soil or waste stack to which the vent stack or main vent is connected, but in no case less than 1-1/2 inches. The maximum number of fixture units connected to the vent stack shall be in accordance with Table P-1110.4. The vent stack or main vent shall not be less in size than the branch, circuit, or loop vent it is servicing. Where fixtures are installed on the house drain behind the line of vent, a minimum vent stack of 1-1/2 inches shall be required for small fixtures having a fixture unit value not greater than 10 and a minimum of 2 inches for one or more water closets and other fixtures, except if a larger size is required according to Table P-1110.4.
P-1110.4 Size of Relief Vent
The diameter of a relief vent shall not be less than one-half the diameter of the horizontal branch to which it is connected, with a minimum size of 1-1/2 inches. The maximum number of fixture units connected to the relief vent shall be in accordance with Table P-1110.4.
|Diameter of Vent (inches) — Maximum Length of Vent (feet)|
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