Lennox Allied Air A95UH1D Installation Instructions Manual page 23

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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