Miele DA 6690 W Operating And Installation Instructions page 41

Connection for air extraction
Recirculation mode
The silencer needs to be positioned
between the exhaust connection and
the directional unit . Ensure there is
adequate space in the tower for fitting
it.
Air extraction with external motor
To minimise noise from the motor in the
kitchen, the silencer should be
positioned in front of the external motor
 if possible, or, if the ducting is long,
above the exhaust connection inside
the rangehood . In the case of an
external motor located inside the house,
fitting a silencer behind the external
motor  reduces the noise of the motor
outside the house.
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