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A93UH1D and 92G1UH-P Maximum Allowable Exhaust Vent Length with Furnace Installed in a Closet or
Number of
90° Elbows
Used
045
070
1
66
51
2
61
46
3
56
41
4
51
36
5
46
31
6
41
26
7
36
21
8
31
16
9
26
11
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Page 20 of 59
Basement Using Ventilated Attic or Crawl Space for Intake in Feet
Standard Termination at Elevation 0 - 10,000 ft
2" Pipe
Capacity
090
110
135
29
9
24
4
19
14
9
n/a
4
n/a
n/a
2-1/2" Pipe
Capacity
045
070
090
110
95
80
48
23
90
75
43
18
85
70
38
13
80
65
33
8
75
60
28
3
70
55
23
65
50
18
n/a
60
45
13
55
40
8
Table 5B.
Issue 1809
3" Pipe
Capacity
135
045
070
090
112
112
93
107
107
88
102
102
83
97
97
78
n/a
92
92
73
87
87
68
82
82
63
77
77
58
72
72
53
110
135
93
89
88
84
83
79
78
74
73
69
68
64
63
59
58
54
53
49
507270-03
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