Miele DA 420V-6 Operating Instructions Manual page 423

 Replace the telescopic piece with the
recirculation grilles at the top.
The spacer frame can be installed
between the tower and the ceiling. This
creates a shadow which gives the
illusion of a gap between the ceiling and
the tower. This is useful if the ceiling is
not level or is uneven. The rangehood is
aligned vertically with the spacers
supplied. Visual irregularities between
the tower and the ceiling are then
concealed by the shadow.
 If you wish to install the rangehood
with the spacer frame, remove the
four inserts from the fixing holes.
Installation
43