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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 cir-
cumstances 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 build-
ing regulations. Seek approval from
the building inspector where neces-
sary.
Use smooth or flexible ducting made
from non-flammable materials for ex-
haust ducting.
When using an external motor, make
sure that the exhaust ducting is suffi-
ciently rigid. The external motor can
cause an underpressure which can
result in the exhaust ducting distort-
ing.
To achieve the most efficient air extrac-
tion 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.
Connection for air extraction
– Ensure that all connections are
strong and airtight.
Remember that any constriction of
the air flow 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 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 condens-
ate cannot drain back into the appli-
ance.
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 ex-
haust ducting will need to be suitably
insulated.
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