Miele DAR 1230 Set 18 Operating instructions - Page 35

duct will need to be insulated., need to be addressed. The exhaust

Page 35 highlights

 When duct is horizontal it must be laid to slope away at at least ¹/₈ inch per foot. This is to ensure that condensate cannot drain back into the appliance.  If the exhaust duct is to be routed through rooms, ceiling space etc., the temperatures in these different areas may differ greatly, which means that the problem of condensation will need to be addressed. The exhaust duct will need to be insulated.  Installation of a non-return flap in the exhaust duct is recommended. It ensures that air, once ducted to the outside, cannot get back into the room again. Air venting 35

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Air venting
35
When duct is horizontal it must be
laid to slope away at at least ¹/₈ inch
per foot. This is to ensure that
condensate cannot drain back into
the appliance.
If the exhaust duct is to be routed
through rooms, ceiling space etc., the
temperatures in these different areas
may differ greatly, which means that
the problem of condensation will
need to be addressed. The exhaust
duct will need to be insulated.
Installation of a non-return flap in the
exhaust duct is recommended. It
ensures that air, once ducted to the
outside, cannot get back into the
room again.