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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.
Use smooth or flexible ducting made
from approved non-flammable
materials for exhaust ducting.
To achieve the most efficient air
extraction 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 exhaust ducting should be as
short and straight as possible.
– Only use wide radius bends.
– The exhaust duct must not be kinked
or compressed.
– Ensure that all connections are
strong and airtight.
Remember that any constriction of
the air flow will reduce extraction
performance 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.
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 appliance.
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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