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Connection for air extraction
20
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 cross-section of the exhaust
ducting must not be smaller than the
cross-section of the exhaust
connection (see "Appliance
dimensions").
– 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 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 1 cm per
metre. This is to ensure that
condensate cannot drain back into
the downdraft extractor.
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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