Miele DA 1050-55 Operating And Installation Instructions page 28

Installation
 Check the position of the deflector.
Extraction
Recirculation
 Remove the deflector if necessary
and turn it as appropriate for the
operating mode required. To do this,
press the two hooks, remove the
deflector, turn it and push it back in
until it clicks into position.
28
 For operation in recirculation mode,
cover the opening at the back of the
rangehood with the sticker supplied
with the NoSmell active charcoal filter
(optional accessory).