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TABLE 10
Maximum Allowable Intake or Exhaust Vent Length
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 ft
Number Of
90° Elbows
Used
2" Pipe
2−1/2" Pipe
3" Pipe
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
1
81
66
44
24
115
115
93
58
138
137
118
118
2
76
61
39
19
110
110
88
53
133
132
113
113
3
71
56
34
14
105
105
83
48
128
127
108
108
4
66
51
29
n/a
100
100
78
43
123
122
103
103
5
61
46
24
n/a
95
95
73
38
118
117
98
98
6
56
41
19
n/a
90
90
68
33
113
112
93
93
7
51
36
14
n/a
85
85
63
28
108
107
88
88
8
46
31
n/a
n/a
80
80
58
23
103
102
83
83
9
41
26
n/a
n/a
75
75
53
18
98
97
78
78
10
36
21
n/a
n/a
70
70
48
13
93
92
73
73
Standard Termination Elevation 4500 − 10,000 ft
Number Of
90° Elbows
Used
2" Pipe
2−1/2" Pipe
3" Pipe
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
1
81
66
44
n/a
115
115
93
58
138
137
118
118
2
76
61
39
n/a
110
110
88
53
133
132
113
113
3
71
56
34
n/a
105
105
83
48
128
127
108
108
4
66
51
29
n/a
100
100
78
43
123
122
103
103
5
61
46
24
n/a
95
95
73
38
118
117
98
98
6
56
41
19
n/a
90
90
68
33
113
112
93
93
7
51
36
14
n/a
85
85
63
28
108
107
88
88
8
46
31
n/a
n/a
80
80
58
23
103
102
83
83
9
41
26
n/a
n/a
75
75
53
18
98
97
78
78
10
36
21
n/a
n/a
70
70
48
13
93
92
73
73
Concentric Termination at Elevation 0 − 4500 ft
Number Of 90°
Elbows Used
2" Pipe
2−1/2" Pipe
3" Pipe
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
1
73
58
42
22
105
105
89
54
121
121
114
114
2
68
53
37
17
100
100
84
49
116
116
109
109
3
63
48
32
12
95
95
79
44
111
111
104
104
4
58
43
27
n/a
90
90
74
39
106
106
99
99
5
53
38
22
85
85
69
34
101
101
94
94
6
48
33
17
80
80
64
29
96
96
89
89
7
43
28
12
75
75
59
24
91
91
84
84
8
38
23
n/a
70
70
54
19
86
86
79
79
9
33
18
65
65
49
14
81
81
74
74
10
28
13
60
60
44
n/a
76
76
69
69
Concentric Termination Elevation 4501 − 10,000 ft
Number Of 90°
Elbows Used
2" Pipe
2−1/2" Pipe
3" Pipe
Model
Model
Model
045
070
090
110
045
070
090
110
045
070
090
110
1
73
58
42
n/a
105
105
89
54
121
121
114
114
2
68
53
37
100
100
84
49
116
116
109
109
3
63
48
32
95
95
79
44
111
111
104
104
4
58
43
27
90
90
74
39
106
106
99
99
5
53
38
22
85
85
69
34
101
101
94
94
6
48
33
17
80
80
64
29
96
96
89
89
7
43
28
12
75
75
59
24
91
91
84
84
8
38
23
n/a
70
70
54
19
86
86
79
79
9
33
18
65
65
49
14
81
81
74
74
10
28
13
60
60
44
n/a
76
76
69
69
