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1-1/2" Pipe
Number of 90°
Elbows Used
045
1
15
2
10
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
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.
507769-05G / 31-5000656
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 2,000 ft
Capacity
070
090
045
15
61
10
56
51
46
41
n/a
36
n/a
31
26
21
16
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 2,001 - 10,000 ft
2" Pipe
Capacity
045
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
46
24
100
41
19
95
36
14
90
31
85
26
80
21
75
16
n/a
70
11
65
60
n/a
55
Table 7A.
2-1/2" Pipe
Capacity
045
070
100
73
95
68
90
63
85
58
80
53
75
48
70
43
65
38
60
33
55
28
Table 7B.
Issue 2223
2-1/2" Pipe
Capacity
070
090
045
80
43
127
75
38
122
70
33
117
65
28
112
60
23
107
55
18
102
50
13
97
45
92
40
n/a
87
35
82
Capacity
090
045
43
127
38
122
33
117
28
112
23
107
18
102
13
97
92
n/a
87
82
3" Pipe
Capacity
070
090
127
108
122
103
117
98
112
93
107
88
102
83
97
78
92
73
87
68
82
63
3" Pipe
070
090
127
108
122
103
117
98
112
93
107
88
102
83
97
78
92
73
87
68
82
63
Page 17 of 55
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