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Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl
1-1/2" Pipe
Number of 90°
Elbows Used
045
1
10
2
3
4
5
6
n/a
7
8
9
10
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl
1-1/2" Pipe
Number of 90°
Elbows Used
045
1
2
3
4
5
n/a
6
7
8
9
10
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
507769-05G / 31-5000656
Space For Intake Air in Feet
Standard Termination at Elevation 0 - 2,000 ft
Capacity
070
090
045
10
51
46
41
36
31
n/a
n/a
26
21
16
11
n/a
Space For Intake Air in Feet
Standard Termination at Elevation 2,001 - 10,000 ft
Capacity
070
090
045
30
25
20
15
10
n/a
n/a
n/a
2" Pipe
Capacity
070
090
045
36
14
85
31
9
80
26
75
21
70
16
65
11
60
n/a
55
50
n/a
45
40
Table 8A.
2" Pipe
Capacity
070
090
045
20
10
80
15
75
10
70
65
60
n/a
55
n/a
50
45
40
35
Table 8B.
Issue 2223
2-1/2" Pipe
Capacity
070
090
045
65
28
107
60
23
102
55
18
97
50
13
92
45
8
87
40
82
35
77
30
n/a
72
25
67
20
62
2-1/2" Pipe
Capacity
070
090
045
53
28
107
48
23
102
43
18
97
38
13
92
33
87
28
82
23
77
n/a
18
72
13
67
n/a
62
3" Pipe
Capacity
070
090
107
88
102
83
97
78
92
73
87
68
82
63
77
58
72
53
67
48
62
43
3" Pipe
Capacity
070
090
107
88
102
83
97
78
92
73
87
68
82
63
77
58
72
53
67
48
62
43
Page 19 of 55
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