Miele DA 3668 Operating And Installation Instructions page 56

Installation
 Tighten the fixing screws from below.
 When fitting a 900 mm wide
rangehood 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 rangehood to the
electricity supply.
The fan switches on again.
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 Press the On/Off touch control  on
the rangehood or the  control on
the remote control repeatedly until
the fan switches off.
The fan switches off. The deflector plate
retracts.