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Connection for air extraction
31
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.
To achieve the greatest possible air
extraction with the lowest noise level,
please note the following:
– The diameter of the exhaust ducting
should not be less than 150mm.
– 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 must 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.
When ducting is horizontal, it must be
laid to slope away at at least 1cm per
metre. This is to ensure that
condensate cannot drain back into
the rangehood.
If the exhaust ducting is to run
through rooms, ceiling space etc.
where there may be great variations
in temperature between the different
areas, the problem of condensation
will need to be addressed. The
exhaust ducting will need to be
suitably insulated.
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