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TABLE 6
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using
Ventilatd Attic or Crawl Space For Intake Air in Feet
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total
vent length calculation.
Standard Termination at Elevation 0 - 10000 ft
No 90°
Elbows
1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
1 20 15 10
n/a n/a n/a
71 56 34 14
n/a
100 100 78 43
n/a
118 117 98 98 60
2 15 10
n/a
66 51 29 9 95 95 73 38 113 112 93 93 55
3 10
n/a
61 46 24 4 90 90 68 33 108 107 88 88 50
4
n/a
56 41 19
n/a
85 85 63 28 103 102 83 83 45
5 51 36 14 80 80 58 23 98 97 78 78 40
6 46 31 9 75 75 53 18 93 92 73 73 35
7 41 26 4 70 70 48 13 88 87 68 68 30
8 36 21
n/a
65 65 43 8 83 82 63 63 25
9 31 16 60 60 38 3 78 77 58 58 20
10 26 11 55 55 33 n/a 73 72 53 53 15
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