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The Ontario Building Code | Branch Vents, Headers, Continuous Vents and Circuit Vents

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., unless they are individual vents or dual vents.

Table 7.5.8.3.
Sizing of Branch vents, Headers, Continuous vents and circuit Vents

Forming Part of Article 7.5.8.3.

Item

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(1)(2)

1.

2

9

NL

NL

NL

NL

NL

NL

NL

2.

8

9

30

61

NL

NL

NL

NL

NL

3.

20

7.5

15

46

NL

NL

NL

NL

NL

4.

24

4.5

9

30

NL

NL

NL

NL

NL

5.

42

NP

9

30

NL

NL

NL

NL

NL

6.

60

NP

4.5

15

120

NL

NL

NL

NL

7.

100

NP

NP

11

79

305

NL

NL

NL

8.

200

NP

NP

9

76

275

NL

NL

NL

9.

500

NP

NP

6

55

215

NL

NL

NL

10.

1 100

NP

NP

NP

15

61

215

NL

NL

11.

1 900

NP

NP

NP

6

21

61

215

NL

12.

2 200

NP

NP

NP

NP

9

27

105

335

13.

3 600

NP

NP

NP

NP

7.5

18

76

245

14.

5 600

NP

NP

NP

NP

NP

7.5

18

76

Notes to Table 7.5.8.3.:

(1)NL means not limited.

(2)NP means not permitted.

(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, headeror open air.

(3) For the purposes of Table 7.5.8.3., the length of a header shall be its developed lengthfrom 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, headeror open air.

(5) For the purposes of Table 7.5.8.3., the length of a continuous vent shall be its developed length from the vertical soil or waste pipe connection to a vent stack, stack vent, headeror open air.