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

Current through Register Vol. 50, No. 6, June 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).