For Air Extraction Mode - Miele DA 1255 Operating And Installation Instructions

Installation
 Hang the cooker hood on the
brackets.
 Tighten both screws at the back of
the cooker hood on the left and right.
This adjusts the alignment of the
cooker hood to prevent it being lifted
off the fixing brackets.
 Replace the lamps.
 Replace the grease filters.
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For air extraction mode

 For  150 mm exhaust ducting, cut
the exhaust socket to size with a
sharp knife.
For  125 mm exhaust ducting the
exhaust socket is installed as it is.
 Insert the non-return flap, if required.
Make sure that it opens easily and
closes again by itself.