508034-02
Issue 2135
Page 20 of 49
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard 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
81
66
44
24
138
137
118
118
2
76
61
39
19
133
132
113
113
3
71
56
34
14
128
127
108
108
4
66
51
29
n/a
123
122
103
103
5
61
46
24
118
117
98
98
6
56
41
19
113
112
93
93
7
51
36
14
108
107
88
88
8
46
31
n/a
103
102
83
83
9
41
26
98
97
78
78
10
36
21
93
92
73
73
Standard 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
81
41
34
9
138
105
100
65
2
76
36
29
n/a
133
100
95
60
3
71
31
24
128
95
90
55
4
66
26
19
123
90
85
50
5
61
21
14
118
85
80
45
6
56
16
9
113
80
75
40
7
51
11
n/a
108
75
70
35
8
46
n/a
103
70
65
30
9
41
98
65
60
25
10
36
93
60
55
20
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 12A.