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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 combustion 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 approximately 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 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
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 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.