*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
Number Of
90° Elbows
Used
045
1
81
2
76
3
71
4
66
5
61
6
56
7
51
8
46
9
41
10
36
Number Of
90° Elbows
Used
045
1
81
2
76
3
71
4
66
5
61
6
56
7
51
8
46
9
41
10
36
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Maximum Allowable Intake or Exhaust Vent Length in Feet