Connection For Air Extraction - Miele DA 6890 Operating And Installation Instructions

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If the cooker hood is used at the
same time as a heating appliance
that relies on oxygen from the same
room, there is a risk in certain
circumstances of toxic fumes
building up.
It is essential that the "Warning and
Safety" instructions are observed.
The cooker hood should be installed
according to local and national
building regulations. Seek approval
from the building inspector where
necessary.
For ducting, use smooth pipes or
flexible ducting made from approved
non-flammable materials.
To achieve the most efficient air flow
rate with the lowest noise levels, please
note the following:
- The diameter of the exhaust ducting
should not be less than 150 mm.
- If flat ducting is being used, the cross
section must not be smaller than the
cross sectional area of the exhaust
connection.
- The ducting should be as short and
straight as possible.
- Only use wide radius bends.
- The ducting must not be kinked or
compressed.
- Ensure that all connections are
strong and airtight.
Remember that any constriction of
the air flow will reduce the air flow
rate and increase operating noise.

Connection for air extraction

 If the exhaust is ducted through an
outside wall, a telescopic wall vent or
a roof vent (available as an optional
accessory) is recommended.
 If the exhaust air is to be ducted into
a flue, the ducting must be directed in
the flow direction of the flue.
 Where ducting is horizontal, it must
be laid to slope away at a gradient of
at least 1 cm per metre. This is to
ensure that condensate cannot drain
back into the cooker hood.
 If the ducting is to run through cool
rooms, ceiling space, etc., there may
be significant variations in
temperature between the different
areas. The problem of condensation
will need to be addressed. The
ducting will need to be suitably
insulated.
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