Miele T 490 Operating Instructions Manual page 30

Installation - venting
Installing several machines:
We recommend that when several ma-
chines are being installed each ma-
chine should be fitted with a non-return
flap (available from a good builders'
merchant). This will prevent odours
being transferred and the build up of
condensation in the machines which
are not in use.
For installation where up to 5 machines
are connected to a shared system the
pipe diameter (D) must be increased.
The factor to increase by is given in
Table III.
30
Table III
Number of
machines
2
3
4-5
Duct diameter
increase factor from
Table II
1.00
1.25
1.50