Miele PDR 914 Operating And Installation Instructions page 56

Installation
Example 2
B2
L1
B1
PDR 914/514
1. Total pipe length
PDR 914/514
56
Common combined exhaust ducting for multiple appliances should
only be considered as a solution in exceptional cases.
Configuring combined exhaust ducting made from steel for the PDR
914/514 and PDR 918/518 series tumble dryers:
L1–L4 each 6' 6" (2 m) steel piping
B1–B3 each 90° concertina pipe elbow (r = 2d)
B4 45° elbow (r = 2d)
B5 90° elbow (r = d)
If the exhaust from multiple appliances is to be ducted into a com-
bined line, a non-return device must be installed in each separate
line to prevent backflow.
L2
B4
L3
B3
PDR 918/518
Steel pipe
Steel pipe
Steel pipe
90° concertina pipe
elbow (r = 2d)
90° concertina pipe
elbow (r = 2d)
90° elbow (r = d)
Total duct length
* Substitute pipe lengths according to Table 1
L4
B5
L1 = 6' 6" (2.0 m)
L2 = 6' 6" (2.0 m)
L4 = 6' 6" (2.0 m)
B1 = 10' 6" (3.2 m)*
B2 = 10' 6" (3.2 m)*
B5 = 6' 3" (1.9 m)*
46' 11" (14.3 m)