Lennox Allied Air A95UH1D Installation Instructions Manual page 23

Warm air gas furnace
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A95UH1D and 95G1UH-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
10
21
6
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
10
21
6
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
507270-03
Basement Using Ventilated Attic or Crawl Space for Intake in Feet
Standard Termination at Elevation 0 - 4,500 ft
2" Pipe
Capacity
090
110
135
29
9
24
4
19
14
9
n/a
4
n/a
n/a
Standard Termination Elevation 4,501 - 10,000 ft
2" Pipe
Capacity
090
110
135
29
24
19
14
9
n/a
n/a
4
n/a
2-1/2" Pipe
Capacity
045
070
090
110
95
95
73
38
90
90
68
33
85
85
63
28
80
80
58
23
75
75
53
18
70
70
48
13
65
65
43
8
60
60
38
3
55
55
33
n/a
50
50
28
2-1/2" Pipe
Capacity
045
070
090
110
95
95
73
38
90
90
68
33
85
85
63
28
80
80
58
23
75
75
53
18
70
70
48
13
65
65
43
8
60
60
38
3
55
55
33
n/a
50
50
28
Table 6C.
Issue 1917
3" Pipe
Capacity
135
045
070
090
113
112
93
108
107
88
103
102
83
98
97
78
93
92
73
n/a
88
87
68
83
82
63
78
77
58
73
72
53
68
67
48
3" Pipe
Capacity
135
045
070
090
113
112
93
108
107
88
103
102
83
98
97
78
93
92
73
n/a
88
87
68
83
82
63
78
77
58
73
72
53
68
67
48
110
135
93
89
88
84
83
79
78
74
73
69
68
64
63
59
58
54
53
49
48
44
110
135
93
89
88
84
83
79
78
74
73
69
68
64
63
59
58
54
53
49
48
44
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