Miele DA 3668 Operating And Installation Instructions page 44

Installation
44
 Screw the brackets onto the right and
left inside walls of the housing unit so
that they are flush with the bottom
edges of the unit. The brackets are
designed for 16 and 19 mm thick unit
sides. Orientate the bracket so that
the vertical depth matches the
thickness of the unit side, as shown.
 Fit the screws for attaching the
cooker hood so that they protrude by
about 5 mm, as shown. Only use the
front screws when fitting a 900 mm
wide cooker hood in a 600 mm wide
wall unit.