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1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
070
1
2
3
4
5
n/a
6
7
8
9
10
1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
070
1
2
3
4
5
n/a
6
7
8
9
10
*Size intake and exhaust pipe length separately. Values in table are for intake OR Exhaust, not combined total. Both Intake and
Exhaust must be same pipe size.
508405-01
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 4,500 ft
090
110
070
43
38
33
28
23
n/a
n/a
18
13
n/a
Concentric Termination at Elevation 4,501 - 10,000 ft
090
110
070
43
38
33
28
23
n/a
n/a
18
13
8
n/a
2" Pipe
Capacity
090
110
070
27
7
90
22
85
17
80
12
75
7
70
n/a
65
60
n/a
55
50
45
2" Pipe
Capacity
090
110
070
27
90
22
85
17
80
12
75
7
70
n/a
65
60
n/a
55
50
45
Table 7B.
Issue 2341
2-1/2" Pipe
Capacity
090
110
070
74
39
106
69
34
101
64
29
96
59
24
91
54
19
86
49
14
81
44
9
76
39
71
34
n/a
66
29
61
2-1/2" Pipe
Capacity
090
110
070
74
39
106
69
34
101
64
29
96
59
24
91
54
19
86
49
14
81
44
9
76
39
71
34
n/a
66
29
61
3" Pipe
Capacity
090
110
99
99
94
94
89
89
84
84
79
79
74
74
69
69
64
64
59
59
54
54
3" Pipe
Capacity
090
110
99
99
94
94
89
89
84
84
79
79
74
74
69
69
64
64
59
59
54
54
Page 19 of 53
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