Page 26
31-5000726 Rev. 0
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 4500 ft
Number
of 90°
Elbows
Used
1-1/2" Pipe
2" Pipe
2-1/2" Pipe
3" Pipe
Model
Model
Model
Model
45
70
90 110 135 45
70
90 110 135 45
70
90 110 135 45
70
90 110 135
1
25
20
n/a n/a n/a
76
61
39
19
n/a
110 110
88
53
n/a
133 132 113 113 109
2
20
15
71
56
34
14
105 105 83
48
128 127 108 108 104
3
15
10
66
51
29
9
100 100 78
43
123 122 103 103 99
4
10
n/a
61
46
24
n/a
95
95
73
38
118 117
98
98
94
5
n/a
56
41
19
90
90
68
33
113 112
93
93
89
6
51
36
14
85
85
63
28
108 107 88
88
84
7
46
31
9
80
80
58
23
103 102 83
83
79
8
41
26
n/a
75
75
53
18
98
97
78
78
74
9
36
21
70
70
48
13
93
92
73
73
69
10
31
16
65
65
43
8
88
87
68
68
64
Standard Termination Elevation 4500 - 10,000 ft
Number
of 90°
Elbows
Used
1-1/2" Pipe
2" Pipe
2-1/2" Pipe
3" Pipe
Model
Model
Model
Model
45
70
90 110 135 45
70
90 110 135 45
70
90 110 135 45
70
90 110 135
1
25
20
n/a n/a n/a
76
61
39
n/a n/a
110 110
88
53
n/a
133 132 113 113 109
2
20
15
71
56
34
105 105 83
48
128 127 108 108 104
3
15
10
66
51
29
100 100 78
43
123 122 103 103 99
4
10
n/a
61
46
24
95
95
73
38
118 117
98
98
94
5
n/a
56
41
19
90
90
68
33
113 112
93
93
89
6
51
36
14
85
85
63
28
108 107 88
88
84
7
46
31
9
80
80
58
23
103 102 83
83
79
8
41
26
n/a
75
75
53
18
98
97
78
78
74
9
36
21
70
70
48
13
93
92
73
73
69
10
31
16
65
65
43
8
88
87
68
68
64
*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.
Table 10A.