RPD-I-S Rev A
12
Venting continued-
TABLE 1 - VENT CONNECTOR LENGTHS
FOR 3” (7.6 cm) DIAMETER VENT PIPE
Terminating
# of Elbows
(excl. vent
term.)
Maximum straight
Length
ft
(m)
Minimum
straight
Length
ft
(m)
48, 65
gal.
75 gal.
Through the Wall
1 55
(16.8)
45
(13.7)
2
(.6)
Through the Wall
2 50
(15.2)
40
(12.2)
2
(.6)
Through the Wall
3 45
(13.7)
35
(10.7)
2
(.6)
Through the Wall
4 40
(12.2)
30
(9.1)
2
(.6)
Through the Roof
0 60
(18.3)
50
(15.2)
7
(2.1)
Through the Roof
1 55
(16.8)
45
(13.7)
7
(2.1)
Through the Roof
2 50
(15.2)
40
(12.2)
7
(2.1)
Through the Roof
3 45
(13.7)
35
(10.7)
7
(2.1)
TABLE 2 -VENT CONNECTOR LENGTHS
FOR 4” (10.2 cm) DIAMETER VENT PIPE
Terminating
# of 90
Elbows (excl.
vent term.)
Maximum straight
Length
ft
(m)
Min
straight
Length
ft
(m)
48, 65 gal.
75 gal.
Through the Wall
1 95
(29.0)
85
(25.9)
10
(3.1)
Through the Wall
2 90
(27.4)
80
(24.4)
10
(3.1)
Through the Wall
3 85
(25.9)
75
(22.9)
10
(3.1)
Through the Wall
4 80
(24.4)
70
(21.3)
10
(3.1)
Through the Wall
5 75
(22.9)
65
(19.8)
10
(3.1)
Through the Roof
0 100
(30.5)
90
(27.4)
15
(4.6)
Through the Roof
1 95
(29.0)
85
(25.9)
15
(4.6)
Through the Roof
2 90
(27.4)
80
(24.4)
15
(4.6)
Through the Roof
3 85
(25.9)
75
(22.9)
15
(4.6)
Through the Roof
4 80
(24.4)
70
(21.3)
15
(4.6)
IMPORTANT
The minimum equivalent length for the exhaust portion of the vent is 7
feet. The maximum equivalent vent length for the exhaust is 60 feet for
3” diameter pipe (50 feet for the 75 gal.) and 100 feet for 4” diameter
pipe (90 feet for the 75 gal.). The intake portion of the vent must be
equal to or less than the vent length of the exhaust. The tables below
are provided for your quick reference, some installations may require a
greater number of elbows. When calculating equivalent vent length,
one 90º elbow is equivalent to 5 feet.
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