Miele Touchtronic T 9820 Installation Instructions Manual page 21

Example
Rigid pipe
A
B
C
D
Total duct
length
The total duct length is less than 33 feet (10 m), so a duct diameter of 4" (100 mm)
with adapter is sufficient.
Wall duct with
louvered wall vent
90° bend
20" (0.5 m) rigid pipe
90° bend
Duct length
ft
12' 5"
2' 4"
1' 7"
2' 4"
18' 8"
Ducting
Duct length
m
3.8 m
0.7 m
0.5 m
0.7 m
5.7 m
21