Example:Calculating the effective duct length and required internal
duct diameter
Rigid pipe Duct length
ft
Duct length
m
AWall duct with
louvered wall vent
12’ 5" 3.8 m
B90° bend 2’ 7" 0.8 m
C20" (0.5 m) rigid pipe 1’ 7" 0.5 m
D90° bend 2’ 7" 0.8 m
Eleft vent opening 3’ 3" 1.0 m
Total duct length 22’ 5" 6.9 m
The total duct length is less than 33 feet (10 m), so a duct diameter of 4" (100 mm)
with adapter is sufficient.
Installation
34