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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 combus-
tion gas ducts. The air outlet must under no circumstances be
connected to entilation ducts for rooms in which fuel-burning
appliances are installed.
The air outlet installation must comply with the regulations laid down
by the rele ant authorities.
When the unit is used in its extractor ersion, a sufficiently large
entilation hole must be pro ided, 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/en ironment combination) is
entilated from outside using a suitable entilation hole approxi-
mately 500-600 cm2 large to a oid the possibility of a depression
being created during operation of the hood.
If you ha e any doubts, contact the rele ant controlling authority or
building inspectors office.
Since the rule for rooms with fuel burning appliances is outlet hole
of the same size as the entilation hole, a hole of 500-600 cm2,
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 abo e 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
ne er install the hoses with an acute angle, they must always
follow a gentle cur e.
keep the hose as large as possible (preferably the same diam-
eter as the outlet hole).
Failure to obser e these basic instructions will drastically reduce the
performance and increase the noise le els of the extractor hood.