Louisiana Administrative Code
Title 51 - PUBLIC HEALTH-SANITARY CODE
Part XIV - Plumbing
Chapter 9 - Vents
Section XIV-937 - Size and Length of Vents

Universal Citation: LA Admin Code XIV-937

Current through Register Vol. 50, No. 3, March 20, 2024

A. Length of Vent Stacks. The length of the vent stack or main vent shall be its developed length from the lowest connection of the vent system with the soil stack, waste stack, or building drain to the vent stack terminal, if it terminates separately, or to the connection of the vent stack with the stack vent, plus the developed length of the stack-vent from the connection to the terminal, if the two vents are connected together with a single extension.

B. Size of Stack-Vents, Vent Stacks, Relief Vents, Individual Vents or Branch Vents. The diameter of a stack-vent, vent stack, relief vent, individual vent or branch vent shall not be less than one-half of the diameter of the drain served, but in no case less than 1 1/4 inches, and shall be determined from its length and the total of fixture units connected thereto, as provided in Table 937.B of this code. All water closets vents shall be a minimum of 2 inches in diameter. This shall not be interpreted to allow the alteration or elimination of the need for at least one 3-inch vent stack or stack vent on the building drain as required under §905. C.1 of this code.

C. Size of Battery Vents. The diameter of a battery vent shall be not less than one-half the pipe size of the horizontal waste line it is venting, but in no case less than 1 1/2 inches, and shall be determined from its length and the total of fixture units connected thereto, as provided in Table 937.C of this code. The diameter and horizontal length of a battery vent shall in no case be less than permitted in Table 937.C of this code. (See §925 of this code).

Table 937.B

Maximum Length of Vents (ft)

(Other than Battery Vents)

(See Table 937.C of this Code for Battery Venting)

Size of Soil or Waste Stack (in)

Fixture Units Connected

Diameter of Vent Required (in)

1 1/4

1 1/2

2

2 1/2

3

4

5

6

8

1 1/4

2

30 ft

-

-

-

-

-

-

-

-

1 1/2

8

50 ft

150 ft

-

-

-

-

-

-

-

1 1/2

10

30 ft

100 ft

-

-

-

-

-

-

-

2

12

30 ft

75 ft

200 ft

-

-

-

-

-

-

2

20

26 ft

50 ft

150 ft

-

-

-

-

-

-

2 1/2

42

-

30 ft

100 ft

300 ft

-

-

-

-

-

3

10

-

30 ft

100 ft

200 ft

600 ft

-

-

-

-

3

30

-

-

60 ft

200 ft

500 ft

-

-

-

-

3

60

-

-

50 ft

80 ft

400 ft

-

-

-

-

4

100

-

-

35 ft

100 ft

260 ft

1000 ft

-

-

-

4

200

-

-

30 ft

90 ft

250 ft

900 ft

-

-

-

4

500

-

-

20 ft

70 ft

180 ft

700 ft

-

-

-

5

200

-

-

-

35 ft

80 ft

350 ft

1000 ft

-

-

5

500

-

-

-

30 ft

70 ft

300 ft

900 ft

-

-

5

1100

-

-

-

20 ft

50 ft

200 ft

700 ft

-

-

6

350

-

-

-

25 ft

50 ft

200 ft

400 ft

1300 ft

-

6

620

-

-

-

15 ft

30 ft

125 ft

300 ft

1100 ft

-

6

960

-

-

-

-

24 ft

100 ft

250 ft

1000 ft

-

6

1900

-

-

-

-

20 ft

70 ft

200 ft

700 ft

-

8

600

-

-

-

-

-

50 ft

150 ft

500 ft

1300 ft

8

1400

-

-

-

-

-

40 ft

100 ft

400 ft

1200 ft

8

2200

-

-

-

-

-

30 ft

80 ft

350 ft

1100 ft

8

3600

-

-

-

-

-

25 ft

60 ft

250 ft

800 ft

10

1000

-

-

-

-

-

-

75 ft

125 ft

1000 ft

10

2500

-

-

-

-

-

-

50 ft

100 ft

500 ft

10

3800

-

-

-

-

-

-

30 ft

80 ft

350 ft

10

5600

-

-

-

-

-

-

25 ft

60 ft

250 ft

Table 937.C

Battery Vent Sizing Table

Maximum Horizontal Length (ft)

Soil or waste pipe diam. (in)

Maximum no. Fixture units

Diameter of circuit or loop vent (in)

1 1/2

2

2 1/2

3

4

5

2

3

15 ft

40 ft

-

-

-

-

2 1/2

6

10 ft

30 ft

-

-

-

-

3

10

-

20 ft

40 ft

100 ft

-

-

4

80

-

7 ft

20 ft

52 ft

200 ft

-

5

180

-

-

-

16 ft

70 ft

200 ft

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(7) and R.S. 40:5(2)(3)(7)(9)(16)(17)(20).

Disclaimer: These regulations may not be the most recent version. Louisiana may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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