Miele DA 3668 Operating And Installation Instructions page 56

Installation
 Tighten the four fixing screws from
below.
 When fitting a 900 mm wide cooker
hood in a 600 mm wide wall unit,
insert the two rear screws at this
stage.
If the wall unit has side sections, you
will also need to secure it to the base
on either side.
 Reconnect the cooker hood to the
electricity supply.
The fan switches on again.
56
 Press the On/Off control  on the
cooker hood or the  control on the
remote control repeatedly until the
fan switches off.
The fan switches off. The deflector plate
retracts.