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Connection for air extraction
Before installation, it is important
to read the information given on the
following pages as well as the
"Appliance dimensions" and the
"Warning and Safety instructions" at
the beginning of this booklet. This is
particularly crucial when using the
rangehood at the same time as a
heating appliance that relies on
oxygen from the same room, which
could result in the build-up of toxic
fumes.
The rangehood should be installed
according to local and national
building regulations. Seek approval
from the building inspector where
necessary.
Only use smooth pipes or flexible
hoses made from non-flammable
materials for the extraction ducting.
Highly flexible, concertina type
ducting material will greatly reduce
the performance of the rangehood.
When using an external motor, make
sure that the exhaust ducting is
sufficiently rigid. The external motor
can cause an underpressure which
can result in the exhaust ducting
distorting.
To achieve the greatest possible air
extraction with the lowest noise level,
please note the following:
To ensure efficient air extraction, the
diameter of the exhaust ducting
should not be less than 150 mm.
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– A reduction in diameter will
compromise the extraction
performance of the rangehood.
– If flat ducting is being used, the
cross-sectional area must not be
smaller than the cross-sectional area
of the exhaust connection.
– The exhaust ducting should be as
short and straight as possible.
– Only use wide radius bends.
– The exhaust ducting should not be
kinked or compressed.
– Ensure that all connections are
strong and airtight.
Remember that any constriction of
the airflow will reduce extraction
performance and increase operating
noise.
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 vent flue, the ducting must be
directed in the flow direction of the
flue.