Page 23
TABLE 14
Maximum Allowable Intake or Exhaust Vent Length in Feet
*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 - 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
61
46
24
n/a
100
80
43
n/a
127
127
108
108
2
56
41
19
95
75
38
122
122
103
103
3
51
36
14
90
70
33
117
117
98
98
4
46
31
n/a
85
65
28
112
112
93
93
5
41
26
80
60
23
107
107
88
88
6
36
21
75
55
18
102
102
83
83
7
31
16
70
50
13
97
97
78
78
8
26
11
65
45
n/a
92
92
73
73
9
21
n/a
60
40
87
87
68
68
10
16
55
35
82
82
63
63
Concentric Termination Elevation 0 - 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
53
38
22
n/a
90
70
39
n/a
111
111
104
104
2
48
33
17
85
65
34
106
106
99
99
3
43
28
12
80
60
29
101
101
94
94
4
38
23
n/a
75
55
24
96
96
89
89
5
33
18
70
50
19
91
91
84
84
6
28
13
65
45
14
86
86
79
79
7
23
n/a
60
40
n/a
81
81
74
74
8
18
55
35
76
76
69
69
9
13
50
30
71
71
64
64
10
n/a
45
25
66
66
59
59
TABLE 15
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated
Attic or Crawl Space For Intake Air in Feet
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 - 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
51
36
14
n/a
85
65
28
n/a
107
107
88
88
2
46
31
9
80
60
23
102
102
83
83
3
41
26
4
75
55
18
97
97
78
78
4
36
21
n/a
70
50
13
92
92
73
73
5
31
16
65
45
8
87
87
68
68
6
26
11
60
40
3
82
82
63
63
7
21
6
55
35
n/a
77
77
58
58
8
16
1
50
30
72
72
53
53
9
11
n/a
45
25
67
67
48
48
10
6
40
20
62
62
43
43