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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.
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.
It is advisable to apply for authorization from the relevant control-
ling 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.
National and regional building regulations impose a number of
restrictions on using hoods and fuel-burning appliances con-
nected to a chimney, such as coal or oil room-heaters and gas
fires, in the same room.
The local decree on fuel-burning systems specifies a maximum
depression of 0.04 mbar in such rooms.
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 negative
pressure 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 out fuel burning appliances is “air
inlet should be same size as extractor outlet hole”, an aperture 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 version (carbon filter), 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
— minimum number of bends in the outlet hose
— Install hoses with an acute angle, always following a gentle
curve only
— hose as large as possible (100 mm Ø).
Failure to observe these basic rules will drastically reduce the
performance and increase the noise levels of the extractor hood.
Safety warnings
for kitchen unit
installer