508107-01
Issue 2041
Page 29 of 58
A93UH1E & 92G1UHE Maximum Allowable Exhaust Vent Length with Furnace Installed in a Closet or Basement
Using Ventilated Attic or Crawl Space for Intake in Feet
Standard Termination at Elevation 0 - 10,000 ft
Number of
90° Elbows
Used
1-1/2" Pipe
2" Pipe
2-1/2" Pipe
3" Pipe
Capacity
Capacity
Capacity
Capacity
030 /
045
070
090
110
030 /
045
070
090
110
030 /
045
070
090
110
030 /
045
070
090
110
1
20
15
n/a
n/a
66
51
29
9
95
80
48
23
112
112
93
93
2
15
10
61
46
24
4
90
75
43
18
107
107
88
88
3
10
n/a
56
41
19
n/a
85
70
38
13
102
102
83
83
4
n/a
51
36
14
80
65
33
8
97
97
78
78
5
46
31
9
75
60
28
3
92
92
73
73
6
41
26
4
70
55
23
n/a
87
87
68
68
7
36
21
n/a
65
50
18
82
82
63
63
8
31
16
60
45
13
77
77
58
58
9
26
11
55
40
8
72
72
53
53
NOTE
: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Table 12.
