508146-01
Issue 2051
Page
38
of 7
0
Maximum Allowable Intake or Exhaust Vent Length (feet)
Concentric Termination at Elevation 0 - 4,500 ft
Number of
90° Elbows
Used
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
Model
70
90
110
135
70
90
110
135
70
90
110
135
70
90
110
135
1
15
n/a
n/a
n/a
78
62
n/a
n/a
125
84
34
n/a
141
134
109
100
2
10
73
57
120
79
29
136
129
104
95
3
n/a
68
52
115
74
24
131
124
99
90
4
63
47
110
69
19
126
119
94
85
5
58
42
105
64
14
131
114
89
80
6
53
37
100
59
9
116
109
84
75
7
48
32
95
54
n/a
111
104
79
70
8
43
27
90
49
106
99
74
65
9
38
22
85
44
101
94
69
60
10
33
17
80
39
96
89
64
55
Concentric Termination Elevation 4,501 - 10,000 ft
Number of
90° Elbows
Used
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
Model
70
90
110
135
70
90
110
135
70
90
110
135
70
90
110
135
1
10
n/a
n/a
n/a
53
37
n/a
n/a
100
59
n/a
n/a
116
109
84
75
2
n/a
48
32
95
54
111
104
79
70
3
43
27
90
49
106
99
74
65
4
38
22
85
44
101
94
69
60
5
33
17
80
39
96
89
64
55
6
28
12
75
34
91
84
59
50
7
23
7
70
29
86
79
54
45
8
18
n/a
65
24
81
74
49
40
9
13
60
19
76
69
44
35
10
8
55
14
71
64
39
30
*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 22B.
