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