SPS 382.31(14)(b)1.1. Vent header pipe sizes shall be determined in accordance with Table 382.31-3 with the number of drainage fixture units being the sum of the fixture unit loads of the stacks vented through that portion of the header. The diameter of a vent header shall not be less than any vent connecting to it.
SPS 382.31(14)(b)2.
2. The developed length of the vent header shall be measured along the pipe from the most distant vent stack or stack vent base connection to the vent terminal.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(c)
(c) Branch vents. Branch vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the branch vent shall be measured along the pipe from the furthest fixture drain served by the branch vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(d)
(d) Individual vents. Individual vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of an individual vent shall be measured along the vent pipe from the fixture drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(14)(e)
(e) Common vents. Common vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of a common vent shall be measured along the vent pipe from the drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to the vent terminal.
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See PDF for table 
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See PDF for table SPS 382.31(14)(f)
(f) Circuit vents. Circuit vent pipe sizes shall be determined in accordance with Table 382.31-3. The developed length of the circuit vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31(14)(g)
(g) Relief vents. Relief vents shall be sized in accordance with the provisions of subds.
1. to
3. The developed length of a relief vent shall be measured along the vent from the connection with the branch drain served by the vent to the point where it connects to a vent pipe of a larger diameter or to a vent terminal.
SPS 382.31(14)(g)1.
1. `Circuit vented branch drain.' The diameter of a relief vent for a branch drain served by a circuit vent shall be at least one half the diameter of the branch drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(g)2.
2. `Building drain.' The diameter of a relief vent serving a building drain, as required in sub.
(7), shall be at least one half the diameter of the building drain. The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(g)3.
3. `Horizontal wet vent.' The diameter of a relief vent serving a horizontal wet vent shall be at least 1
1⁄
2". The maximum developed length shall be determined from Table 382.31-3 based on the number of drainage fixture units served by the vent.
SPS 382.31(14)(h)
(h) Yoke vents. A yoke vent serving a drain stack shall be sized as a vent stack in accordance with par.
(a).
SPS 382.31(14)(i)1.a.a. Except as provided in subd.
1. b., the size of a vent for a sanitary pump with other than a pneumatic ejector, shall be determined in accordance with Table 382.31-4.
SPS 382.31(14)(i)1.b.
b. The size of a vent for a sanitary sump located outside with other than a pneumatic ejector shall be determined in accordance with Table 382.31-4, but shall not be less than 2
‶ in diameter.
SPS 382.31(14)(i)2.
2. The air pressure relief pipe from a pneumatic ejector shall not be connected to vent or vent system serving a sanitary drain system, storm drain system or chemical waste system.
SPS 382.31(14)(i)2.a.
a. The relief pipe shall be of a size to relieve the air pressure inside the ejector to atmospheric pressure, but shall not be less than 2" in diameter where the ejector is located outside and 1
1/
4" in diameter for all other ejector locations.
SPS 382.31(14)(j)
(j) Vents for chemical basins. The size of vents serving chemical dilution or neutralizing basins shall be determined in accordance with Table 382.31-3 and based upon the number of drainage fixture units discharging into the basins.
SPS 382.31(15)(a)
(a)
Vent grade. All vent and branch vent pipes shall be graded and connected so as to drain back to a drain pipe by means of gravity.
SPS 382.31(15)(b)1.
1. Except for wet vent piping, the connection of a vent to horizontal drain piping shall be at a point above the horizontal center line of the drain piping.
SPS 382.31(15)(b)2.
2. Except as provided in subs.
(12) and
(17), vent piping serving a wall-outlet fixture may not offset horizontally less than 36" above the floor, but in no case lower than the elevation of the highest flood level rim of any fixture served by the vent.
SPS 382.31(15)(b)3.
3. Vent piping may not connect to a branch vent less than 38" above the floor, but in no case lower than 2" above the elevation of the highest flood level rim of any fixture served by the vent.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(16)
(16)
Vent terminals. All vents and vent systems shall terminate in the open air in accordance with this subsection.
SPS 382.31(16)(a)
(a) Extension above roofs. Extensions of vents through a roof shall terminate at least 8" above the roof. Where the roof is to be used for any purpose other than weather protection, the vents shall extend at least 7 feet above the roof.
SPS 382.31(16)(b)
(b) Waterproof flashings. The penetration of a roof system by a vent shall be made watertight with an approved flashing.
SPS 382.31(16)(c)
(c) Prohibited uses. Vent terminals shall not be used as flag poles, support for antennas or other similar purposes.
SPS 382.31(16)(d)1.c.
c. At least 10 feet horizontally from or 2 feet above roof scuttles, doors, and openable windows.
SPS 382.31(16)(d)2.
2. Where a structure has an earth covered roof extending from surrounding grade, the vent extension shall run at least 7 feet above grade and terminate with an approved vent cap. The portion of vent pipe outside the structure shall be without joints, except one fitting may be installed where the pipe leaves the top or side of the structure.
SPS 382.31(16)(e)
(e) Extension through wall. A vent shall terminate at least 10 feet horizontally from any lot line. Extension of vents through wall shall terminate beyond the soffit. The vent shall terminate downward and be screened. The vent shall comply with par.
(d).
SPS 382.31(16)(f)
(f) Extensions outside buildings. Drain or vent pipe extensions shall not be located or placed on the outside of an exterior wall of any new building, but shall be located inside the building.
SPS 382.31(16)(g)
(g) Frost closure. For protection against frost closure, each vent terminal shall be at least 2" in diameter. Where it is necessary to increase the diameter of the vent, the change in diameter shall be made at least 6" inside the building.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(16)(h)
(h)
Penetrations through grade. Except when installation is in accordance with par.
(d) 2., penetrations through grade shall terminate at least 12" above finished grade and terminate with a vent cap or return bend.
SPS 382.31(17)
(17)
Combination drain and vent systems. In lieu of providing individual vents, fixtures may be vented in accordance with pars.
(a) to
(d).
SPS 382.31(17)(a)1.1. A drain stack may serve as a combination drain and vent system for fixtures in accordance with subd.
1. a. to
e. SPS 382.31(17)(a)1.a.
a. The drain stack shall not serve more than 3 fixtures. Each fixture shall be located on a separate floor level.
SPS 382.31(17)(a)1.b.
b. The drain stack shall be limited to serving fixtures with a drainage fixture unit value of no greater than 2.0. A urinal may not discharge into the combination drain and vent portion of the stack. The largest drainage fixture unit value served by the stack shall determine the stack size as specified in Table 382.31-5.
SPS 382.31(17)(a)1.c.
c. The drain stack shall not be offset horizontally above the lowest fixture drain connection.
SPS 382.31(17)(a)1.d.
d. The developed length of any fixture drain from the trap weir to the drain stack shall not exceed the limits specified in Table 382.31-1.
SPS 382.31(17)(a)1.e.
e. The drain stack and its attendant vent shall be sized in accordance with Table 382.31-5.
SPS 382.31(17)(a)2.
2. A drain stack may serve as a combination drain and vent system for a kitchen sink and a wall outlet fixture with a drainage fixture unit value of 2 or less in accordance with subd.
2. a. to
d. SPS 382.31(17)(a)2.a.
a. One kitchen sink within a dwelling unit, with or without a food waste grinder or dishwasher connection, shall connect to the drain stack above the wall outlet fixture with a drainage fixture unit value of 2 or less. No other fixtures may connect to the drain stack.
SPS 382.31(17)(a)2.b.
b. The drain stack shall be at least 2 inches in diameter below the kitchen sink connection and it shall be at least 4 inches in diameter below the connection to the lower fixture.
SPS 382.31(17)(a)2.c.
c. In lieu of the minimum sizes as required in subd.
2. b., the entire stack below the kitchen sink connection may be 3 inches in diameter.
SPS 382.31(17)(a)2.d.
d. The drain stack shall not offset horizontally above the fixture drain connection for the lower fixture.
SPS 382.31(17)(b)
(b) Building drains. A building drain or a building subdrain may serve as a combination drain and vent system for floor drains and floor outlet fixtures in accordance with subds.
1. to
6. SPS 382.31(17)(b)1.
1. A vent or drain at least 2 inches in diameter shall be connected upstream of any building drain branch or building subdrain branch.
SPS 382.31(17)(b)2.
2. No more than 2 water closets may connect to the building drain or building subdrain by means of building drain branches or building subdrain branches.
SPS 382.31(17)(b)3.a.a. That portion of the building drain or building subdrain between the connection of the building drain branch or building subdrain branch and the vent or drain required in subd.
1. shall be at least one pipe size larger than the minimum size permitted in Table 382.30–3 based on the total drainage fixture unit load, but not less than 3 inches.
SPS 382.31(17)(b)3.b.
b. The vent or drain required in subd.
1. shall be at least one-half the diameter of that portion of the building drain or building subdrain which is vented by the vent or drain, but may not be less than 2 inches in diameter.
SPS 382.31(17)(b)3.c.
c. A vent serving a drain required in subd.
1., shall be at least one half the diameter of that portion of the building drain or building subdrain which is vented by the system, but may not be less than 2 inches in diameter.
SPS 382.31(17)(b)4.
4. The trap of a floor drain or a floor outlet fixture, except a water closet, connected to a building drain branch or building subdrain branch shall be at least 3" in diameter.
SPS 382.31(17)(b)5.
5. A building drain branch or building subdrain branch may not connect to a building drain or building subdrain downstream from the base fitting of a drain stack 2" or larger in diameter within the distance equal to 20 pipe diameters of the building drain or building subdrain.
SPS 382.31(17)(b)6.
6. The pitch and the developed length of the building drain branch or building subdrain branch may not exceed the limits specified in Table 382.31-1.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(17)(c)
(c) Laboratory sink venting. A horizontal drain may serve as a combination drain and vent system for island laboratory sinks in accordance with subds.
1. to
7. SPS 382.31(17)(c)1.
1. A vent stack or a drain stack at least 2" in diameter shall be connected upstream of any fixture drain vented by the combination drain and vent system.
SPS 382.31(17)(c)2.a.a. That portion of the horizontal drain between the connection of fixture drain and the vent stack or drain stack required in subd.
1. shall be at least one pipe size larger than the minimum size permitted in Table 382.30-2 based on total drainage fixture unit load.
SPS 382.31(17)(c)2.b.
b. The vent stack or drain stack required in subd.
1. shall be at least one-half the diameter of that portion of the horizontal drain which is vented by the stack, but may not be less than 2
‶ in diameter.
SPS 382.31(17)(c)2.c.
c. A stack vent serving a drain stack required in subd.
1. shall be at least one half the diameter of that portion of the horizontal drain which is vented by the stack, but may not be less than 2" in diameter.
SPS 382.31(17)(c)3.
3. All fixture drains vented by the horizontal drain shall be at least 3" in diameter.
SPS 382.31(17)(c)4.
4. Fixture drains to be vented by the horizontal drain shall connect individually to the horizontal drain.
SPS 382.31(17)(c)5.
5. An individual vent or common vent shall be extended as high as possible under the sink enclosure and then returned vertically downward and connected to the horizontal drain. A cleanout shall be provided on the vent piping.
SPS 382.31(17)(c)6.
6. In lieu of connecting the vent to the horizontal drain which forms the combination drain and vent system, the vent may connect to a horizontal fixture drain vented by the combination drain and vent system. The pitch and developed length of the horizontal fixture drain shall not exceed the limits specified in Table 382.31-1.
SPS 382.31(17)(c)7.
7. Fixture drains to be vented by the horizontal drain shall not connect to a horizontal drain downstream from the base fitting of a drain stack 2" or larger in diameter within the distance equal to 20 pipe diameters of the horizontal drain serving the stack.
SPS 382.31 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.31(17)(d)3.
3. The drain stack may not offset horizontally above the lowest threshold drain connection.
SPS 382.31(17)(d)4.
4. Elevator threshold drains, provided with individual traps that utilize other means of venting, are permitted to discharge into the stack.
SPS 382.31(17)(d)5.
5. The drain stack shall be limited to serving elevators threshold drains serving elevator door areas.
