// CODE SNIPPET
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.
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.
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.
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.
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.
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.
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California Plumbing Code 2019 > 9 Vents > 908.0 Wet Venting > 908.2 Horizontal Wet Venting for a Bathroom Group > 908.2.2 Size
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The wet vent shall be sized based on the
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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