Page 40
TABLE 24
Maximum Allowable Intake or Exhaust Vent Length in Feet
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.
Standard Termination at Elevation 0 - 4500'
Number Of
90° Elbows
Used
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
070
090
110
070
090
110
070
090
110
1
91
69
14
140
93
43
162
143
118
2
86
64
9
135
88
38
157
138
113
3
81
59
n/a
130
83
33
152
133
108
4
76
54
125
78
28
147
128
103
5
71
49
120
73
23
142
123
98
6
66
44
115
68
18
137
118
93
7
61
39
110
63
13
132
113
88
8
56
34
105
58
n/a
127
108
83
9
51
29
100
53
122
103
78
10
46
24
95
48
117
98
73
Standard Termination Elevation 4501' - 7500'
Number Of
90° Elbows
Used
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
070
090
110
070
090
110
070
090
110
1
66
69
14
115
93
43
137
143
118
2
61
64
9
110
88
38
132
138
113
3
56
59
n/a
105
83
33
127
133
108
4
51
54
100
78
28
122
128
103
5
46
49
95
73
23
117
123
98
6
41
44
90
68
18
112
118
93
7
36
39
85
63
13
107
113
88
8
31
34
80
58
n/a
102
108
83
9
26
29
75
53
97
103
78
10
21
24
70
48
92
98
73
Standard Terminating at Elevation 7501' - 10,000''
Number Of
90° Elbows
Used
2” Pipe
2-1/2” Pipe
3” Pipe
Model
Model
Model
070
090
110
070
090
110
070
090
110
1
41
44
n/a
90
68
n/a
112
118
93
2
36
39
85
63
107
113
88
3
31
34
80
58
102
108
83
4
26
29
75
53
97
103
78
5
21
24
70
48
92
98
73
6
16
19
65
43
87
93
68
7
11
14
60
38
82
88
63
8
n/a
n/a
55
33
77
83
58
9
50
28
72
78
53
10
45
23
67
73
48
NOTE
- Table 23 continued on next page with concentric terminations.