507270-03Page 20 of 60 Issue 1917
A93UH1D and 92G1UH-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 - 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 9
n/a
95 80 48 23
n/a
112 112 93 93 89
2 61 46 24 4 90 75 43 18 107 107 88 88 84
3 56 41 19
n/a
85 70 38 13 102 102 83 83 79
4 51 36 14 80 65 33 8 97 97 78 78 74
5 46 31 9 75 60 28 3 92 92 73 73 69
6 41 26 4 70 55 23
n/a
87 87 68 68 64
7 36 21
n/a
65 50 18 82 82 63 63 59
8 31 16 60 45 13 77 77 58 58 54
9 26 11 55 40 8 72 72 53 53 49
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Table 5B.
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