Lennox Allied Air A95UH1D - Page 23

507270-03 Page 23 of 60Issue 1917
Table 6C.
A95UH1D and 95G1UH-P 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 - 4,500 ft
Number of
90° Elbows
Used
2" Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 66 51 29 9
n/a
95 95 73 38
n/a
113 112 93 93 89
2 61 46 24 4 90 90 68 33 108 107 88 88 84
3 56 41 19
n/a
85 85 63 28 103 102 83 83 79
4 51 36 14 80 80 58 23 98 97 78 78 74
5 46 31 9 75 75 53 18 93 92 73 73 69
6 41 26 4 70 70 48 13 88 87 68 68 64
7 36 21
n/a
65 65 43 8 83 82 63 63 59
8 31 16 60 60 38 3 78 77 58 58 54
9 26 11 55 55 33
n/a
73 72 53 53 49
10 21 6 50 50 28 68 67 48 48 44
Standard Termination Elevation 4,501 - 10,000 ft
Number of
90° Elbows
Used
2" Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 66 51 29
n/a n/a
95 95 73 38
n/a
113 112 93 93 89
2 61 46 24 90 90 68 33 108 107 88 88 84
3 56 41 19 85 85 63 28 103 102 83 83 79
4 51 36 14 80 80 58 23 98 97 78 78 74
5 46 31 9 75 75 53 18 93 92 73 73 69
6 41 26 4 70 70 48 13 88 87 68 68 64
7 36 21
n/a
65 65 43 8 83 82 63 63 59
8 31 16 60 60 38 3 78 77 58 58 54
9 26 11 55 55 33
n/a
73 72 53 53 49
10 21 6 50 50 28 68 67 48 48 44
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.