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Example
Rigid pipe Duct length
ft
Duct length
m
A
Wall duct with
louvered wall vent
12’ 5" 3.8 m
B
90° bend
2’ 4" 0.7 m
C
20" (0.5 m) rigid pipe
1’ 7" 0.5 m
D
90° bend
2’ 4" 0.7 m
Total duct
length
18’ 8" 5.7 m
The total duct length is less than 33 feet (10 m), so a duct diameter of 4" (100 mm)
with adapter is sufficient.
Ducting
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