508151-01
Issue 2104
Page 34 of 72
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
45
70
90
110
45
70
90
110
45
70
90
110
1
20
15
n/a
n/a
66
51
29
9
100
100
78
43
123
122
103
103
2
15
10
61
46
24
n/a
95
95
73
38
118
117
98
98
3
10
n/a
56
41
19
90
90
68
33
113
112
93
93
4
n/a
51
36
14
85
85
63
28
108
107
88
88
5
46
31
9
80
80
58
23
103
102
83
83
6
41
26
n/a
75
75
53
18
98
97
78
78
7
36
21
70
70
48
13
93
92
73
73
8
31
16
65
65
43
8
88
87
68
68
9
26
11
60
60
38
n/a
83
82
63
63
10
21
6
55
55
33
78
77
58
58
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
45
70
90
110
45
70
90
110
45
70
90
110
1
20
15
n/a
n/a
66
51
29
n/a
100
100
78
43
123
122
103
103
2
15
10
61
46
24
95
95
73
38
118
117
98
98
3
10
n/a
56
41
19
90
90
68
33
113
112
93
93
4
n/a
51
36
14
85
85
63
28
108
107
88
88
5
46
31
9
80
80
58
23
103
102
83
83
6
41
26
n/a
75
75
53
18
98
97
78
78
7
36
21
70
70
48
13
93
92
73
73
8
31
16
65
65
43
8
88
87
68
68
9
26
11
60
60
38
n/a
83
82
63
63
10
21
6
55
55
33
78
77
58
58
*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 19A.