Miele DA 6698 D Operating And Installation Instructions page 52

Installation
A non-return flap is supplied with the
hood or is already fitted in the exhaust
socket of the motor unit (depending on
model).
 With vented mode (AE) insert the
non-return flap in the exhaust socket
if your ducting system is not
equipped with one.
Recirculation mode (RM) does not
require the non-return flap to be
inserted. If there is one present, it
should be removed.
52
 Hang the hood on the brackets,
making sure that the controls are at
the front.
 Secure the hood with the screws
supplied.