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1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
070
1
15
2
10
3
4
5
6
n/a
7
8
9
10
1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
070
1
15
2
10
3
4
5
6
n/a
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.
Page 18 of 53
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 4,500 ft
090
110
070
51
46
41
36
31
n/a
n/a
26
21
16
11
6
Standard Termination at Elevation 4,501 - 10,000 ft
090
110
070
51
46
41
36
31
n/a
n/a
26
21
16
11
n/a
2" Pipe
Capacity
090
110
070
29
9
100
24
95
19
90
14
85
9
80
n/a
75
70
n/a
65
60
55
2" Pipe
Capacity
090
110
070
29
100
24
95
19
90
14
85
9
80
n/a
75
70
n/a
65
60
55
Table 7A.
Issue 2341
2-1/2" Pipe
Capacity
090
110
070
78
43
122
73
38
117
68
33
112
63
28
107
58
23
102
53
18
97
48
13
92
43
8
87
38
82
n/a
33
77
2-1/2" Pipe
Capacity
090
110
070
78
43
122
73
38
117
68
33
112
63
28
107
58
23
102
53
18
97
48
13
92
43
8
87
38
82
n/a
33
77
3" Pipe
Capacity
090
110
103
103
98
98
93
93
88
88
83
83
78
78
73
73
68
68
63
63
58
58
3" Pipe
Capacity
090
110
103
103
98
98
93
93
88
88
83
83
78
78
73
73
68
68
63
63
58
58
508405-01
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