DUCT RUN CALCULATION EXAMPLE:
One roof cap
, two 90
º elbow, and one 45 º elbow used: 0ft + 9ft +
9ft + 5ft = 23ft used.
Deduct 23ft from 50ft, 27ft maximum available for straight duct run.
Calculating Vent System Length
To calculate the length of the system you need, deduct the equivalent feet for
each vent piece used in the system from the recommended maximum duct run.
DUCT RUN CALCULATION:
Recommended maximum run
6” or 3-1/4 × 10”
duct
50 ft
Vent piece deduction
Each 90° elbow used
9 ft
Each 45° elbow used
5 ft
Each 6” to 3-1/4 × 10” transition used
7 ft
Side wall cap with damper
0 ft
Roof cap
0 ft
10
Summary of Contents for Rome VRH-ROME-30SS
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