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// CODE SNIPPET

908.2 Horizontal Wet Venting for a Bathroom Group

California Plumbing Code 2016 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group
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A bathroom group located on the same floor level shall be permitted to be vented by a horizontal wet vent where all of the conditions of Section 908.2.1 through Section 908.2.5 are met.

908.2.1 Vent Connection

The dry vent connection to the wet vent shall be an individual vent for the bidet, shower, or bathtub. One or two vented lavatory(s) shall be permitted to serve as a wet vent for a bathroom group. Only one wet-vented fixture drain or trap arm shall discharge upstream of the dry-vented fixture drain connection. Dry vent connections to the horizontal wet vent shall be in accordance with Section 905.2 and Section 905.3.

908.2.2 Size

The wet vent shall be sized based on the fixture unit discharge into the wet vent. The wet vent shall be not less than 2 inches (50 mm) in diameter for 4 drainage fixture units (dfu) or less, and not less than 3 inches (80 mm) in diameter for 5 dfu or more. The dry vent shall be sized in accordance with Table 702.1 and Table 703.2 based on the total fixture units discharging into the wet vent.

908.2.3 Trap Arm

The length of the trap arm shall not exceed the limits in Table 1002.2. The trap size shall be in accordance with Section 1003.3. The vent pipe opening from the horizontal wet vent, except for water closets and similar fixtures, shall not be below the weir of the trap.

908.2.4 Water Closet

The water closet fixture drain or trap arm connection to the wet vent shall be downstream of fixture drain or trap arm connections to the horizontal wet vent.

908.2.5 Additional Fixtures

Additional fixtures shall discharge downstream of the wet vent system and be conventionally vented. Only the fixtures within the bathroom group shall connect to the wet-vented horizontal branch.

Related Code Sections


908.2 Vents, Horizontal Wet Venting for a Bathroom Group
A bathroom group located on the same floor level shall be permitted to be vented by a horizontal wet vent where all of the conditions of Section ...
California Plumbing Code 2019 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group
908.2 Vents, Horizontal Wet Venting for a Bathroom Group
A bathroom group located on the same floor level shall be permitted to be vented by a horizontal wet vent where all of the conditions of Section ...
California Plumbing Code 2016 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group
908.2.4 Vents, Water Closet
The water closet fixture drain or trap arm connection to the wet vent shall be downstream of fixture drain or trap arm connections to the horizontal ...
California Plumbing Code 2016 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group > 908.2.4 Water Closet
908.2.2 Vents, Size
The wet vent shall be sized based on the fixture unit discharge into the wet vent. The wet vent shall be not less than 2 inches (50 mm) in diameter ...
California Plumbing Code 2019 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group > 908.2.2 Size
908.2.2 Vents, Size
The wet vent shall be sized based on the fixture unit discharge into the wet vent. The wet vent shall be not less than 2 inches (50 mm) in diameter ...
California Plumbing Code 2016 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group > 908.2.2 Size
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