Miele DA 1255 Operating And Installation Instructions page 31

 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.
 For operation in recirculation mode,
cover the opening at the back of the
cooker hood with the protective foil
supplied with the charcoal filter
(optional accessory).
Installation
31