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1-1/2" Pipe
Number
of 90°
Model
Elbows
45
70
Used
1
15
10
2
10
3
4
5
6
n/a
n/a
7
8
9
10
1-1/2" Pipe
Number
of 90°
Model
Elbows
45
70
Used
1
15
10
2
10
3
4
5
6
n/a
n/a
7
8
9
10
*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.
Page 18 of 52
Maximum Allowable Intake or Exhaust Vent Length (feet)
Concentric Termination at Elevation 0 - 4,500 ft
2" Pipe
Model
90
110
45
70
58
43
53
38
48
33
43
28
38
23
n/a
n/a
33
18
28
13
23
18
n/a
13
Concentric Termination at Elevation 4,501 - 10,000 ft
2" Pipe
Model
90
110
45
70
58
43
53
38
48
33
43
28
38
23
n/a
n/a
33
18
28
13
23
8
18
n/a
13
2-1/2" Pipe
Model
90
110
45
70
27
7
90
90
22
85
85
17
80
80
12
75
75
7
70
70
n/a
65
65
60
60
n/a
55
55
50
50
45
45
2-1/2" Pipe
Model
90
110
45
70
27
90
90
22
85
85
17
80
80
12
75
75
7
70
70
n/a
65
65
60
60
n/a
55
55
50
50
45
45
Table 7B.
Issue 2327
3" Pipe
Model
90
110
45
70
74
39
106
106
69
34
101
101
64
29
96
96
59
24
91
91
54
19
86
86
49
14
81
81
44
9
76
76
39
71
71
34
n/a
66
66
29
61
61
3" Pipe
Model
90
110
45
70
74
39
106
106
69
34
101
101
64
29
96
96
59
24
91
91
54
19
86
86
49
14
81
81
44
9
76
76
39
71
71
34
n/a
66
66
29
61
61
90
110
99
99
94
94
89
89
84
84
79
79
74
74
69
69
64
64
59
59
54
54
90
110
99
99
94
94
89
89
84
84
79
79
74
74
69
69
64
64
59
59
54
54
508391-01
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