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• 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 approximately
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 diameter
as the outlet hole).
• Failure to observe these basic instructions will drastically reduce the
performance and increase the noise levels of the extractor hood.