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TABLE 23
Maximum Allowable Exhaust Vent Length Using Ventilated 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 - 10,000 ft
Number
Of 90°
Elbows
Used
1-1/2 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110
1 15 10
n/a n/a
61 46 24
n/a
90 90 68 33 108 107 88 88
2 10
n/a
56 41 19 85 85 63 28 103 102 83 83
3
n/a
51 36 14 80 80 58 23 98 97 78 78
4 46 31 9 75 75 53 18 93 92 73 73
5 41 26 4 70 70 48 13 88 87 68 68
6 36 21
n/a
65 65 43 8 81 82 63 63
7 31 16 60 60 38 3 78 77 58 58
8 26 11 55 55 33
n/a
73 72 53 53
9 21 6 50 50 28 68 67 48 48
10 16 1 45 45 23 63 62 43 43
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