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• The national Standard on fuel-burning systems specifies a maxi-
mum 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 inspector’s 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
safely in the above conditions without the need for any of the
aforementioned measures.
• When the hood is used in its extractor function, the following rules
must be followed to obtain optimal operation:
— short and straight outlet hose
— keep bends in outlet hose to a minimum
— never install the hoses with an acute angle, they must always
follow a gentle curve.
— keep the hose as large as possible (preferably the same diam-
eter as the outlet hole).
• Failure to observe these basic instructions will drastically reduce the
performance and increase the noise levels of the extractor hood.