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Section 7.5.  Venting Systems

Sec 7-7.2 materials, 7.3-piping-testing, 7.4-drainage-cleanouts, 7.5-venting-sizing, 7.6-7.7-potable water

7.5.1.  Vent Pipes for Traps
7.5.1.1.  Venting for Traps
    (1)  Except as provided in Sentences (3) and (4), every trap shall be protected by a vent pipe.
    (2)  Drainage systems shall be protected by the installation of a system as provided in Subsections 7.5.4. and 7.5.5. by the installation of,
    (a)   additional circuit vents,
    (b)   branch vents,
     (c)   circuit vents,
    (d)   continuous vents,
     (e)   dual vents,
     (f)   fresh air inlets,
     (g)   headers,
    (h)   individual vents,
      (i)   offset relief vents,
     (j)   relief vents,
    (k)   stack vents,
      (l)   vent stacks,
   (m)   wet vents, or
    (n)   yoke vents.
    (3)  A trap that serves a floor drain or hub drain need not be protected by a vent pipe separately where,
    (a)   the size of the trap is not less than 3 in.,
    (b)   the length of the fixture drain is not less than 450 mm,
     (c)   the fall on the fixture drain does not exceed its size, and
    (d)   the trap is connected to a horizontal drainage pipe that terminates at its upstream end in a 3 in. stack.
    (4)  A trap need not be protected by a vent pipe,
    (a)   where it serves,
               (i)   a subsoil drainage pipe, or
              (ii)   a storm drainage system, or
    (b)   where it forms part of an indirect drainage system.
7.5.2.  Wet Venting
7.5.2.1.  Wet Venting
    (1)  A soil or waste pipe may serve as a wet vent provided that,
    (a)   the hydraulic load is in accordance with Table 7.5.8.1.,
    (b)   the number of wet vented water closets does not exceed 2,
     (c)   when 2 water closets are installed, they are connected at the same level to a vertical part of the stack by means of a double fitting in accordance with Table 7.2.4.5.,
    (d)   the water closets are installed downstream of all other fixtures,
     (e)   trap arms and fixture drains connected to the wet vent do not exceed 2 in. in size, except for connections from floor drains in accordance with Sentence 7.5.1.1.(3),
     (f)   the total hydraulic load on the wet vent does not exceed the limits stated in Table 7.5.8.1. when separately vented branches or fixture drains in the same storey, having a total hydraulic load not greater than 2 fixture units, are connected to a wet vent or a wet vented water closet trap arm,
     (g)   the hydraulic load to be considered when sizing a continuous vent, that serves a wet vent only includes the hydraulic load that is wet vented,
    (h)   when a wet vent extends through more than one storey, the total discharge from any one storey above the first storey does not exceed 4 fixture units,
      (i)   there is not more than one nominally horizontal offset in the wet vent, and,
               (i)   the offset does not exceed 1 200 mm for pipes 2 in. or less in size, or
              (ii)   the offset does not exceed 2 500 mm for pipes larger than 2 in. in size,
     (j)   the wet vented portion is not reduced in size except for the portion that is upstream of floor drains in accordance with Sentence 7.5.1.1.(3), and
    (k)   the length of the wet vent is not limited.
7.5.3.  Circuit Venting
7.5.3.1.  Circuit Venting
    (1)  A section of a horizontal branch may be circuit vented provided,
    (a)   a circuit vent is connected to it,
    (b)   all fixtures serve by the circuit vent are located in the same storey and located at the most distant upstream section of the horizontal branch, and
     (c)   no soil or waste stack is connected to it upstream of a circuit vented fixture.
    (2)  Fixtures with fixture outlet pipes less than 2 in. in size shall be separately vented or separately circuit vented.
    (3)  Except as provided in Sentences (4) and (5), a relief vent shall be connected to the branch that forms part of a circuit vented system, downstream of the connection of the most downstream circuit vented fixture.
    (4)  A soil or waste pipe having a hydraulic load not greater than 6 fixture units may act as a relief vent for a branch that is being circuit vented.
    (5)  A symmetrically connected relief vent may serve as a combined relief vent for a maximum of 2 branches that are circuit vented, provided there are not more than 8 circuit vented fixtures connected between the combined relief vent and each circuit vent.
    (6)  Additional circuit vents shall be required,
    (a)   when each cumulative horizontal change in direction of a branch served by a circuit vent exceeds 450 between vent pipe connections, or
    (b)   where more than 8 circuit vented fixtures are connected to a branch between vent pipe connections.
    (7)  A soil or waste pipe may serve as an additional circuit vent in accordance with Sentence (6) provided that the soil or waste pipe is sized as a wet vent in conformance with Article 7.5.8.1. and is not less than 2 in. in size.
    (8)  Connections to circuit vents and additional circuit vents in accordance with Sentence (6) shall conform to Sentence 7.5.4.5.(1).
    (9)  A circuit vented branch, including the fixture drain downstream of the circuit vent connection, shall be sized in accordance with Articles 7.4.10.7. and 7.4.10.8., except that it shall be not less than,
    (a)   2 in., where traps less than 2 in. in size are circuit vented, or
    (b)   3 in., where traps 2 in. in size or larger are circuit vented.
    (10)  Additional circuit vents shall be sized in accordance with Table 7.5.7.1. and Sentence 7.5.7.3.(1).
    (11)  The hydraulic load on a circuit vent shall include the hydraulic load from fixtures connected to the branch served by the circuit vent, but shall not include the hydraulic load from fixtures permitted by Sentences (3), (4) and (5).
7.5.4.  Vent Pipes for Soil or Waste Stacks
7.5.4.1.  Stack Vents
    (1)  The upper end of every soil or waste stack shall terminate in a stack vent and the stack vent shall terminate in open air outside the building, or connect directly or through a header to another stack vent or vent stack that does terminate in open air outside the building.
7.5.4.2.  Vent Stacks
    (1)  Except as provided in Sentence (2), every soil or waste stack greater than 4 storeys in height shall have a vent stack.
    (2)  A soil or waste stack that serves as a wet vent does not require a vent stack.
    (3)  The vent stack required by Sentence (1) shall be connected to a vertical section of the soil or waste stack at or immediately below the lowest soil or waste pipe connected to the soil or waste stack.
    (4)  Fixtures may be connected to a vent stack provided,
    (a)   the total hydraulic load of the connected fixtures does not exceed 8 fixture units,
    (b)   at least one fixture is connected to a vertical portion of the vent stack and upstream of any other fixtures,
     (c)   no other fixture is connected downstream of a water closet,
    (d)   all fixtures are located in the lowest storey served by the vent stack, and
     (e)   the section of the vent pipe that acts as a wet vent conforms to the requirements regarding wet vents.
7.5.4.3.  Yoke Vents
    (1)  Except as provided in Sentence (4), where a soil or waste stack receives the discharge from fixtures located on more than 11 storeys, a yoke vent shall be,
    (a)   installed for each section of 5 storeys or part of them counted from the top down,
    (b)   installed at or immediately above each offset or double offset, and
     (c)   sized in accordance with Sentence 7.5.7.5.(1).
    (2)  The yoke vent shall be connected to the soil or waste stack by means of a drainage fitting at or immediately below the lowest soil or waste pipe from the lowest storey of the sections described in Sentence (1).
    (3)  The yoke vent shall connect to the vent stack at least 1 000 mm above the floor level of the lowest storey in the section described in Sentence (1).
    (4)  A yoke vent need not be installed provided the soil or waste stack is interconnected with the vent stack in each storey of the section in which fixtures are located by means of a vent pipe equal in size to the branch or fixture drain or 2 in. in size, whichever is smaller.
7.5.4.4.  Offset Relief Vents
    (1)  A soil or waste stack that has a nominally horizontal offset more than 1 500 mm long and above which the upper vertical portion of the stack passes through more than 2 storeys and receives a hydraulic load of more than 100 fixture units shall be vented by an offset relief vent connected to the vertical section immediately above the offset, and by another offset relief vent,
    (a)   connected to the lower vertical section at or above the highest soil or waste pipe connection, or
    (b)   extended as a vertical continuation of the lower section.
7.5.4.5.  Fixtures Draining into Vent Pipes
    (1)  The trap arm of a fixture that has a hydraulic load of not more than 1 ½ fixture units may be connected to the vertical section of a circuit vent, additional circuit vent, offset relief vent, relief vent or yoke vent, provided that,
    (a)   not more than 2 fixtures are connected to the vent pipe,
    (b)   where 2 fixtures are connected to the vent pipe, the connection is by means of a double sanitary T fitting, and
     (c)   the section of the vent pipe that acts as a wet vent conforms to the requirements regarding wet vents.
7.5.5.  Miscellaneous Vent Pipes
7.5.5.1.  Venting of Sanitary Sewage Sumps
    (1)  Every sump or tank that receives sanitary sewage shall be provided with a vent pipe that is connected to the top of the sump or tank.
7.5.5.2.  Venting of Interceptors
    (1)  Every oil interceptor shall be provided with 2 vent pipes that,
    (a)   connect to the interceptor at opposite ends,
    (b)   extend independently to open air,
     (c)   terminate not less than 2 000 mm above ground and at elevations differing by at least 300 mm, and
    (d)   do not connect to each other or any other vent pipe.
    (2)  Adjacent compartments within every oil interceptor shall be connected to each other by a vent opening.
    (3)  Where a secondary receiver for oil is installed in conjunction with an oil interceptor, it shall be vented in accordance with the manufacturer's recommendations, and the vent pipe shall,
    (a)   in no case be less than 1 ½ inch in size,
    (b)   extend independently to open air, and
     (c)   terminate not less than 2 000 mm above ground.
    (4)  The vent pipes referred to in Sentence (1) are permitted to be one size smaller than the largest connected drainage pipe but not less than 1 ¼ in. in size, or can be sized in accordance with the manufacturer's recommendations.
    (5)  Every vent pipe that serves an oil or grease interceptor and is located outside a building shall be not less than 3 in. in size in areas where it may be subject to frost closure.
    (6)  Every grease interceptor shall have a vent pipe that is not less than 1 ½ in. size connected to the outlet pipe, that connects to the plumbing venting system.
    (7)  A vent pipe shall be provided within 1 500 mm of the inlet to a grease interceptor complete with a cleanout to provide cleaning of the vent pipe.
    (8)  Where an acid waste dilution tank is installed, it shall be provided with a vent pipe connected at the top of the tank and that is sized in accordance with Article 7.5.7.7.
7.5.5.3.  Venting of Corrosive Drain Piping and Dilution Tanks
    (1)  Venting systems for drain piping or dilution tanks conveying corrosive waste shall extend independently and terminate in open air.
7.5.5.4.  Fresh Air Inlets
    (1)  Where a building trap is installed, a fresh air inlet not less than 4 in. in size shall be connected upstream and within 1 200 mm of the building trap and downstream of any other connection.
7.5.5.5.  Provision for Future Installations
    (1)  Where provision is made for a fixture to be installed in the future, the drainage system and venting system shall be sized accordingly and provision made for the necessary future connections.
    (2)  Except as required in Sentence 7.5.7.7.(2), where a plumbing system is installed in a building, every storey in which plumbing is or may be installed, including the basement of a single family dwelling, shall have extended into it or passing through it a vent pipe that is at least 1 ½ in. in size for the provision of future connections.
7.5.6.  Arrangement of Vent Pipes
7.5.6.1.  Drainage of Vent Pipes
    (1)  Every vent pipe shall be installed without depression in which moisture can collect.
    (2)  Every waste pipe shall be installed and back vented at the same time.
7.5.6.2.  Vent Pipe Connections
    (1)  Every vent pipe in a plumbing system shall be installed so as to be direct as possible to a vent stack or open air, as the case may be, and so that any horizontal run below the flood level of the fixture to which the vent pipe is installed is eliminated where structurally possible.
    (2)  Except for wet vents, where a vent pipe is connected to a nominally horizontal soil or waste pipe, the connection shall be above the horizontal centre line of the soil or waste pipe.
    (3)  Unused vent pipes installed for future connections shall be permanently capped with an end cleanout or an adapter and plug.
7.5.6.3.  Location of Vent Pipes
    (1)  Except as provided in Sentences (2) and (3), a vent pipe that protects a fixture trap shall be located so that,
    (a)   the developed length of the trap arm is not less than twice the size of the fixture drain,
    (b)   the total fall of the trap arm is not greater than its inside diameter, and
     (c)   the trap arm does not have a cumulative change in direction of more than 135°.
    (2)  The trap arm of water closets, S-trap standards or any other fixture that also discharges vertically and depends on siphonic action for its proper functioning shall not have a cumulative change in direction of more than 225°.
    (3)  A vent pipe that protects a water closet or any other fixture that also depends on siphonic action for its proper functioning shall be located so that the distance between the connections of the fixture drain to the fixture and the vent pipe shall not exceed,
    (a)   1 000 mm in the vertical plane, and
    (b)   3 m in the horizontal plane.
    (4)  The maximum length and minimum slope of every trap arm shall conform to Table 7.5.6.3.
Table 7.5.6.3.
Length of Trap Arm
Forming Part of Sentence 7.5.6.3.(4)

Column 1

Column 2

Column 3

Size of Trap Served, in.

Maximum Trap Arm, m

Minimum Slope

1 ¼

1.5

1/50

1 ½

1.5

1/50

1

1.5

1/50

2

1.5

1/50

3

1.8

1/50

4

3

1/50

5

4

1/50

6

5

1/50

    (5)  The vent pipe from a water closet or any other fixture that has an integral siphonic flushing action may be connected to the vertical leg of its drainage pipe.
7.5.6.4.  Connection of Vents above Fixtures Served
    (1)  Except for a wet vent, every vent pipe shall extend above the flood level rim of every fixture that it serves before being connected to another vent pipe.
    (2)  No vent pipe shall be connected in such a manner that a blockage in a soil or waste pipe would cause waste to drain through the vent pipe to the drainage system.
7.5.6.5.  Terminals
    (1)  Except as provided in Sentence (3), the upper end of every vent pipe that is not terminated in open air shall be connected to a venting system that terminates through a roof to open air.
    (2)  The upper end of every vent pipe that is terminated in open air, other than a vent pipe that serves an oil interceptor or a fresh air inlet, shall be extended above the roof.
    (3)  Where a vent pipe is installed as a result of additions or alterations to a plumbing system in an existing building, the vent pipe may be erected outside the building, provided that,
    (a)   no single change of direction of the vent pipe exceeds 45°,
    (b)   all parts of the vent pipe are nominally vertical,
     (c)   the vent pipe is increased to not less than 3 in. in size before penetrating a wall or roof, and
    (d)   where the building is 4 storeys or less in height, the vent pipe terminates above the roof of the building.
    (4)  Except for a fresh air inlet, where a vent pipe is terminated in open air, the terminal shall be located,
    (a)   not less than 1 000 mm above or not less than 3.5 m in any other direction from every air inlet, openable window or door,
    (b)   not less than 2 000 mm above or not less than 3.5 m in any other direction from a roof that supports an occupancy, and
     (c)   not less than 2 000 mm above ground.
    (5)  Where a vent pipe passes through a roof, it shall,
    (a)   be terminated high enough to prevent the entry of roof drainage but not less than 150 mm above the roof or above the surface of storm water, which could pond on the roof, and
    (b)   be equipped with flashing to prevent the entry of water between the vent pipe and the roof or the wall.
    (6)  Where a vent pipe passes through a roof or an outside wall of a building, it shall be protected from frost closure by increasing its diameter at least one size, but not less than 3 in. in size, immediately before it penetrates the roof or the wall.
    (7)  Where a vent pipe is located 2 000 mm or more above a roof, it shall be so constructed as to be stable and secure.
    (8)  Flashing shall be of material specified in Article 7.2.10.14. and on a shingled roof shall have a minimum dimension of 500 mm by 500 mm.
    (9)  Where a sleeve flashing is installed on a flat roof it shall extend at least 150 mm above the flood level and on a sloped roof shall be at least 150 mm high on the short side.
    (10)  No bore of a vent stack or stack vent shall be reduced or obstructed by the installation of a flashing.

7.5.7.  Minimum Size of Vent Pipes
7.5.7.1.  General
    (1)  The size of every vent pipe shall conform to Table 7.5.7.1.
Table 7.5.7.1.
Minimum Permitted Size of Vent Pipe Based on Size of Trap
Forming Part of Sentence 7.5.7.1.(1)

Column 1

Column 2

Column 3

Size of Trap Served, in.

Minimum Size of Vent Pipe, in.

Maximum Trap Arm, m

1 ¼

1 ¼

1.5

1 ½

1 ¼

1.5

2

1 ½

1.5

3

1 ½

1.8

4

1 ½

3.0

5

2

4.0

6

2

5.0

7.5.7.2.  Size Restriction
    (1)  The size of a branch vent, stack vent, vent stack or header shall be not less than the size of the vent pipe to which it is connected.
    (2)  Every sanitary building drain shall terminate at its upstream end in a stack of at least 3 in. size.
    (3)  A stack referred to in Sentence (2) shall be a soil stack if one is available and may be a vent stack or waste stack that provides at least 3 in. stack vent and that goes to open air above the roof, either directly or through a header.
7.5.7.3.  Additional Circuit Vents and Relief Vents
    (1)  Except as provided in Article 7.5.7.1. and in Sentence 7.5.3.1.(7), the minimum size of an additional circuit vent or relief vent installed in conjunction with a circuit vent is permitted to be one size smaller than the required size of the circuit vent, but need not be larger than 2 in.
    (2)  The size of the soil or waste pipe acting as a relief vent in accordance with Sentence 7.5.3.1.(4) shall be in conformance with Tables 7.5.8.3. or 7.5.8.4. or Article 7.5.7.1., whichever size is the largest considering the hydraulic load drained into the soil or waste pipe.
7.5.7.4.  Offset Relief Vents
    (1)  Except as provided in Article 7.5.7.1., the minimum size of an offset relief vent is permitted to be one size smaller than the size of the stack vent.
7.5.7.5.  Yoke Vents
    (1)  Yoke vents required by Sentence 7.5.4.3.(1) are permitted to be one size smaller than the size of the smallest pipe to which they are connected.
7.5.7.6.  Vent Pipes for Manholes
    (1)  The minimum size of a vent pipe that serves a manhole within a building shall be 2 in.
7.5.7.7.  Vents for Sanitary Sewage Sumps or Tanks, Dilution Tanks and Macerating Toilet Systems
    (1)  Except as provided in Sentences (2) and (3), the minimum size of the vent pipe for a sanitary sewage sump or tank, or dilution tank shall be one size smaller than the size of the largest branch or fixture drain draining to the sump or tank.
    (2)  The size of every vent pipe for a sanitary sewage sump or tank, or dilution tank shall be not less than 2 in., but need not be greater than 4 in.
    (3)  The size of every vent pipe for a macerating toilet system with a sump or tank shall be not less than 1 ½ in.
7.5.8.  Sizing of Vent Pipes
7.5.8.1.  Hydraulic Loads Draining to Wet Vents
    (1)  The hydraulic load that drains to a wet vent shall conform to Table 7.5.8.1.
    (2)  When determining the size of a wet vent, the hydraulic load from the most downstream fixture or symmetrically connected fixtures shall not be included.
Table 7.5.8.1.
Maximum Permitted Hydraulic Loads Drained to a Wet Vent
Forming Part of Articles 7.5.2.1. and 7.5.8.1.

Column 1

2

3

Size of Wet Vent, in.

Maximum Hydraulic Load, Fixture Units

 

Not Serving Water Closets

Serving Not More Than Two Water Closets

 

 

Fixtures Other Than Water Closets

1 ½

2

N/A

2

4

3

3

12

8

4

36

14

5

N/A

18

6

N/A

23

7.5.8.2.  Individual Vents and Dual Vents
    (1)  The size of individual vents and dual vents shall be determined using Table 7.5.7.1. according to the largest trap served.
    (2)  When sizing an individual vent or a dual vent, the length is not taken into consideration.
7.5.8.3.  Branch Vents, Headers, Continuous Vents and Circuit Vents
    (1)  Branch vents, headers, circuit vents and continuous vents shall be sized in accordance with Table 7.5.8.3.
Table 7.5.8.3.
Sizing of Branch Vents, Headers, Continuous Vents and Circuit Vents
Forming Part of Article 7.5.8.3.

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Total Hydraulic Load Served by Vent, fixture units

Size of Vent Pipe, in.

 

1 ¼

1 ½

2

3

4

5

6

8

 

Maximum Length of Vent Pipe, m

2

9

 

 

 

 

 

 

 

8

9

30

61

 

 

 

 

 

20

7.5

15

46

 

 

 

 

 

24

4.5

9

30

 

 

 

 

 

42

 

9

30

 

 

 

 

 

60

 

4.5

15

120

 

 

 

 

100

 

 

11

79

305

 

 

 

200

 

 

9

76

275

 

 

 

500

 

 

6

55

215

 

 

 

1 100

 

 

 

15

61

215

 

 

1 900

 

 

 

6

21

61

215

 

2 200

 

 

 

 

9

27

105

335

3 600

 

 

 

 

7.5

18

76

245

5 600

 

 

 

 

 

7.5

18

76

    (2)  For the purposes of Table 7.5.8.3., the length of a branch vent shall be its developed length from the most distant soil or waste pipe connection to a vent stack, stack vent, header or open air.
    (3)  For the purposes of Table 7.5.8.3., the length of a header shall be its developed length from the most distant soil or waste pipe connection to open air.
    (4)  For the purposes of Table 7.5.8.3., the length of a circuit vent shall be its developed length from the horizontal soil or waste pipe connection to a vent stack, stack vent, header or open air.

                (5)  For the purposes of Table 7.5.8.3., the length of a continuous vent shall be its devel

loped length from the vertical soil or waste pipe connection to a vent stack, stack vent, header or open air.
7.5.8.4.  Vent Stacks, or Stack Vents
    (1)  A vent stack, or stack vent shall be sized in accordance with Table 7.5.8.4. based on,
    (a)   the length of the vent stack or stack vent, and
    (b)   the total hydraulic load that is drained to the lowest section of soil or waste stack or stacks served by the vent pipe, plus any additional vent loads connected to the vent stack or stack vent.
    (2)  For the purposes of Table 7.5.8.4., the length of a stack vent or vent stack shall be its developed length from its lower end to open air.
    (3)  The minimum size of vent stack or stack vent shall be one-half the size of the soil or waste stack at its base.
    (4)  A stack vent serving a wet vent stack that is over 4 storeys high shall extend the full size of the wet vent to open air.
    (5)  Every sanitary building drain shall be provided with at least one vent that is not less than 3 in. in size.
Table 7.5.8.4.
Size and Developed Length of Stack Vents and Vent Stacks
Forming Part of Article 7.5.8.4.(1)

Column 1

Column 2

Column 3

Column 4

Column 5

Column 6

Column 7

Column 8

Column 9

Column 10

Column 11

Column 12

Size of Soil or Waste Stack, in.

Total Hydraulic Load Being Vented, fixture units

Water Occupied Area

Size of Stack Vent or Vent Stack, in.

 

 

 

1 ½

2

3

4

5

6

8

10

12

 

 

 

Maximum Length of Stack Vent or Vent Stack, m

3

10

0.15

13

46

317

Not Limited

 

21

.20

10

33.5

247

 

 

53

.25

8

28.5

207

 

 

102

.29

7.5

26

189

 

4

43

0.15

Not Permitted

10.5

76

299

Not Limited

 

140

.20

 

8

61

229

 

 

320

.25

 

7

52

195

 

 

540

.29

 

6.5

46

177

 

5

190

0.15

Not Permitted

25

97.5

302

Not Limited

 

490

.20

 

29

76

232

 

 

940

.25

 

16

64

204

 

 

1 400

.29

 

15

58

180

 

6

500

0.15

Not Permitted

10

39.5

122

305

Not Limited

 

1 100

.20

 

8

30.5

94.5

238

 

 

2 000

.25

 

6.5

25.5

79

201

 

 

2 900

.29

 

6

23.5

73

183

 

8

1 800

0.15

Not Permitted

9.5

29

73

287

Not Limited

 

3 400

.20

 

7

22

58

219.5

 

 

5 600

.25

 

6

19

49

186

 

 

7 600

.29

 

5.5

17

43

70.5

 

10

4 000

0.15

Not Permitted

9.5

24

94.5

292.5

Not Limited

 

7 200

.20

 

7

18

73

225.5

 

 

11 000

.25

 

6

15.5

61

192

 

 

15 000

.29

 

5.5

14

55

174

 

12

7 300

0.15

Not Permitted

9.5

36.5

116

287

 

13 000

.20

 

7

28.5

91

219.5

 

20 000

.25

 

6

24

76

186

 

26 000

.29

 

5.5

22

70

152

15

15 000

0.15

Not Permitted

12

39.5

94.5

 

25 000

.20

 

9.5

29

73

 

38 000

.25

 

8

24.5

62

 

50 000

.29

 

7

22.5

55

7.5.8.5.  Lengths for other Vent Pipes
    (1)  When sizing an additional circuit vent, offset relief vent, relief vent, yoke vent and the vent pipe for an interceptor, dilution tank, sanitary sewage tank or sump, or manhole, length is not taken into consideration.
7.5.9.  Air Admittance Valves
7.5.9.1.  Air Admittance Valve as a Vent Terminal
    (1)  Individual vents may terminate with a connection to an air admittance valve as provided in Articles 7.5.9.2. and 7.5.9.3.
7.5.9.2.  Air Admittance Valves
    (1)  Air admittance valves shall only be used to vent,
    (a)   fixtures in buildings undergoing renovation, and
    (b)   installations where connection to a vent may not be practical.
    (2)  The air admittance valves shall be located,
    (a)   above the flood level rim of the fixture it serves,
    (b)   within the maximum developed length permitted for the vent,
     (c)   not less than 150 mm above insulation materials, and
    (d)   installed in a location not subject to back pressure.
    (3)  Air admittance valves shall,
    (a)   only vent fixtures located on the same storey, and
    (b)   be connected to the horizontal fixture drain.
7.5.9.3.  Installation Conditions
    (1)  Air admittance valves shall not be installed in supply or return air plenums, or in locations where they may be exposed to freezing temperatures.
    (2)  Air admittance valves shall be installed in accordance with the manufacturer’s installation instructions.
    (3)  Air admittance valves shall be rated for the size of vent pipe to which they are connected.
    (4)  Installed air admittance valves shall be,
    (a)   accessible, and
    (b)   located in a space that allows air to enter the valve.
    (5)  Every drainage system shall have one vent that terminates to open air in conformance with Sentence 7.5.6.2.(1).

and 7.6-potable water......


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