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The national decree on fuel-burning systems specifies a
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maximum depression of 0.04 bar in such rooms.
The air outlet must not be connected to chimney flues or
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combustion gas ducts. The air outlet must under no circum-
stances be connected to ventilation ducts for rooms in which
fuel-burning appliances are installed.
It is advisable to apply for authorization from the relevant
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controlling authority when connecting the outlet to an unused
chimney flue or combustion gas duct.
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
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large ventilation hole must be provided, with dimensions that
are approximately the same as the outlet hole.
National and regional building regulations impose a number
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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
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
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 only
— keep the hose as large as possible (150 mm Ø min.).
• Failure to observe these basic rules will drastically reduce the
performance and increase the noise levels of the extractor hood.
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large to avoid the possibility of a depression
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,