Example: Calculating the effective duct length and required internal
duct diameter
Rigid pipe Duct length
ft
Duct length
m
A Wall duct with louvered
wall vent
12’ 5" 3.8 m
B 90° bend 2’ 7" 0.8 m
C 20" (0.5 m) rigid pipe 1’ 7" 0.5 m
D 90° bend 2’ 7" 0.8 m
E left 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 of exhaust venting
45
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