Miele DA270 - Manual (Page 7)

The hood offers two modes of
operation:
Air extraction
The air is drawn in and cleaned by the
grease filters and directed outside.
The hood comes equipped with a
non-return flap . This flap automatically
closes when the hood is turned off so
that no exchange of outside air and
room air can occur. When the hood is
turned on, the air pressure of the
exhaust fan automatically opens the
flap blowing the inside air and cooking
odors outside.
Functional description
7