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1-1/2" Pipe
Number of 90°
Elbows Used
045
1
10
2
3
4
5
6
n/a
7
8
9
10
NOTE - 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.
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Number of 90°
Elbows Used
045
1
2
3
4
5
6
7
8
9
10
NOTE - 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.
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Page 18 of 55
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 2,000 ft
Capacity
070
090
045
10
53
48
43
38
33
n/a
n/a
28
23
18
13
n/a
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 2,001 - 10,000 ft
2" Pipe
Capacity
070
090
35
25
15
30
20
10
25
15
20
10
15
10
n/a
n/a
n/a
2" Pipe
Capacity
070
090
045
38
22
90
33
17
85
28
12
80
23
75
18
70
13
65
n/a
60
55
50
45
Table 7C.
2-1/2" Pipe
Capacity
030/
070
045
90
63
85
58
80
53
75
48
70
43
65
38
60
33
55
28
50
23
45
18
Table 7D.
Issue 2223
2-1/2" Pipe
Capacity
070
090
045
70
39
111
65
34
106
60
29
101
55
24
96
50
19
91
45
14
86
40
9
81
35
76
30
n/a
71
25
66
Capacity
030/
090
045
39
111
34
106
29
101
24
96
19
91
14
86
9
81
76
n/a
71
66
507769-05G / 31-5000656
3" Pipe
Capacity
070
090
111
104
106
99
101
94
96
89
91
84
86
79
81
74
76
69
71
64
66
59
3" Pipe
070
090
111
104
106
99
101
94
96
89
91
84
86
79
81
74
76
69
71
64
66
59
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