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For the installer
When used as an extractor unit, the hood must be fitted with a
150mm diameter hose.
Should there already be a pipe of diameter 125 mm that ducts to
the outside through the walls or roof, it is possible to use the 150/
125 mm reduction flange provided. In this case the hood will be
slightly noisier.
When installing the hood, make sure you respect the following
minimum distance from the top edge of the cooking hob/ring
surfaces:
electric cookers 500 mm
gas cookers 650 mm
The hood can be installed above these heights but for optimum
performance it should be installed at the distance quoted for the
appropriate heat source.
The national Standard on fuel-burning systems specifies a maximum
depression of 0.04 mbar in such rooms.
The air outlet must not be connected to chimney flues or combus-
tion gas ducts. The air outlet must under no circumstances be
connected to ventilation ducts for rooms in which fuel-burning
appliances are installed.
The air outlet installation must comply with the regulations laid down
by the relevant authorities.
When the unit is used in its extractor version, a sufficiently large
ventilation hole must be provided, with dimensions that are approxi-
mately the same as the outlet hole.
National and regional building regulations impose a number of
restrictions on using hoods and fuel-burning appliances connected
to a chimney, such as coal or oil room-heaters and gas fires, in the
same room.
Hoods can only be used safely with appliances connected to a
chimney if the room and/or flat (air/environment combination) is
ventilated from outside using a suitable ventilation hole approxi-
mately 500-600 cm
2
large to avoid the possibility of a depression
being created during operation of the hood.
If you have any doubts, contact the relevant controlling authority or
building inspectors office.
Since the rule for rooms with fuel burning appliances is outlet hole
of the same size as the ventilation hole, a hole of 500-600 cm
2
,
which is to say a larger hole, could reduce the performance of the
extractor hood.
If the hood is used in its filtering function, it will operate simply and