508034-02
Issue 2135
Page 21 of 49
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 4500 ft
Number of 90°
Elbows Used
2" Pipe
3" Pipe
Model
Model
040
060
080
100
040
060
080
100
1
73
58
42
22
121
121
114
114
2
68
53
37
17
116
116
109
109
3
63
48
32
12
111
111
104
104
4
58
43
27
n/a
106
106
99
99
5
53
38
22
101
101
94
94
6
48
33
17
96
96
89
89
7
43
28
12
91
91
84
84
8
38
23
n/a
86
86
79
79
9
33
18
81
81
74
74
10
28
13
76
76
69
69
Concentric Termination at Elevation 4501 - 7500 ft
Number of 90°
Elbows Used
2" Pipe
3" Pipe
Model
Model
040
060
080
100
040
060
080
100
1
73
33
32
n/a
121
89
89
61
2
68
28
27
116
84
84
56
3
63
23
22
111
79
79
51
4
58
18
17
106
74
74
46
5
53
13
12
101
69
69
41
6
48
n/a
n/a
96
64
64
36
7
43
91
59
59
31
8
38
86
54
54
26
9
33
81
49
49
21
10
28
76
44
44
16
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.
NOTE
- Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Table 12B.