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A93UH1E & 92G1UHE Maximum Allowable Exhaust Vent Length with Furnace Installed in a Closet or Basement
1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
030 /
070
045
1
20
15
2
15
10
3
10
4
5
6
n/a
n/a
7
8
9
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Pipe size determined in Table 5
2"
EXHAUST
Page 20 of 55
Using Ventilated Attic or Crawl Space for Intake in Feet
Standard Termination at Elevation 0 - 10,000 ft
030 /
090
110
045
66
61
56
51
n/a
n/a
46
41
36
31
26
TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR
NON-DIRECT VENT APPLICATIONS
2"
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
EXHAUST
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
** When transitioning down in pipe size, use at least 1 foot of 2" PVC pipe.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
2" Pipe
Capacity
030 /
070
090
110
045
51
29
9
95
46
24
4
90
41
19
85
36
14
80
31
9
75
26
4
n/a
70
21
65
16
n/a
60
11
55
Table 6.
2"
2"
2"
or
Figure 25.
Issue 1922
2-1/2" Pipe
Capacity
030 /
070
090
110
045
80
48
23
112
75
43
18
107
70
38
13
102
65
33
8
97
60
28
3
92
55
23
87
50
18
82
n/a
45
13
77
40
8
72
3"
or
TRANSITION
*2"
EXHAUST
EXHAUST
DO NOT transition
from larger to smaller
.
pipe in horizontal runs
of exhaust pipe.
EXHAUST
3" Pipe
Capacity
070
090
110
112
93
93
107
88
88
102
83
83
97
78
78
92
73
73
87
68
68
82
63
63
77
58
58
72
53
53
NOTE: 1-1/2" Vent
Pipe Diameter Allowed
Only on 030/045/070
Units
1-1/2"
TRANSITION
**2"
507867-02
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