Page 26
TABLE 14
Maximum Allowable Intake or Exhaust Vent Length in Feet
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
.
Standard Termination at Elevation 0 - 4500 ft
No Of
90°
Elbows
Used
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
045
070
090
110
1
25
20
n/a
n/a
81
66
44
24
115
115
93
58
138
137
118
118
2
20
15
76
61
39
19
110
110
88
53
133
132
113
113
3
15
10
71
56
34
14
105
105
83
48
128
127
108
108
4
10
n/a
66
51
29
n/a
100
100
78
43
123
122
103
103
5
n/a
61
46
24
95
95
73
38
118
117
98
98
6
56
41
19
90
90
68
33
113
112
93
93
7
51
36
14
85
85
63
28
108
107
88
88
8
46
31
n/a
80
80
58
23
103
102
83
83
9
41
26
75
75
53
18
98
97
78
78
10
36
21
70
70
48
13
93
92
73
73
Standard Termination Elevation 4500 - 10,000 ft
No Of
90°
Elbows
Usedl
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
045
070
090
110
1
25
20
n/a
n/a
81
66
44
n/a
115
115
93
58
138
137
118
118
2
20
15
76
61
39
110
110
88
53
133
132
113
113
3
15
10
71
56
34
105
105
83
48
128
127
108
108
4
10
n/a
66
51
29
100
100
78
43
123
122
103
103
5
n/a
61
46
24
95
96
73
38
118
117
98
98
6
56
41
19
90
90
68
33
113
112
93
93
7
51
36
14
85
85
63
28
108
107
88
88
8
46
31
n/a
80
80
58
23
103
102
83
83
9
41
26
75
75
53
18
98
97
78
78
10
36
21
70
70
48
13
93
92
73
73
See concentric terminations next page.