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
1-1/2" Pipe
Of 90° El
bows
Model
Used
045
070
090
1
20
15
2
15
10
3
10
4
5
n/a
6
n/a
7
n/a
8
9
10
Number
1-1/2" Pipe
Of 90° El
bows
Model
Used
045
070
090
1
20
15
2
15
10
3
10
4
5
n/a
6
n/a
7
n/a
8
9
10
TABLE 24 Continued
Maximum Allowable Intake or Exhaust Vent Length in Feet