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1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
045
070
1
20
15
2
15
10
3
10
4
5
6
n/a
7
n/a
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
Number of 90°
Elbows Used
045
1
81
2
76
3
71
4
66
5
61
6
56
7
51
8
46
9
41
10
36
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
507768-05G / 31-5000655
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 2,000 ft
2" Pipe
Capacity
090
110
045
070
81
66
76
61
71
56
66
51
61
46
n/a
n/a
56
41
51
36
46
31
41
26
36
21
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 2,001 - 10,000 ft
2" Pipe
Capacity
070
090
110
35
20
30
15
25
10
20
15
n/a
10
n/a
n/a
2-1/2" Pipe
Capacity
090
110
045
070
44
24
115
115
39
19
110
110
34
14
105
105
29
100
100
24
95
95
19
90
90
14
n/a
85
85
80
80
n/a
75
75
70
70
Table 5A.
2-1/2" Pipe
Capacity
045
070
090
115
110
67
110
105
62
105
100
57
100
95
52
95
90
47
90
85
42
85
80
37
80
75
32
75
70
27
70
65
22
Table 5B.
Issue 2223
Capacity
090
110
045
070
93
58
138
137
88
53
133
132
83
48
128
127
78
43
123
122
73
38
118
117
68
33
113
112
63
28
108
107
58
23
103
102
53
18
98
97
48
13
93
92
3" Pipe
Capacity
110
045
070
53
138
137
48
133
132
43
128
127
38
123
122
33
118
117
28
113
112
23
108
107
18
103
102
13
98
97
n/a
93
92
3" Pipe
090
110
118
118
113
113
108
108
103
103
98
98
93
93
88
88
83
83
78
78
73
73
090
110
118
118
113
113
108
108
103
103
98
98
93
93
88
88
83
83
78
78
73
73
Page 19 of 56
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