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● The national decree on fuel-burning systems specifies a maximum
depression of 0.04 bar 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 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 only
keep the hose as large as possible (120 mm Ø min.).
● Failure to observe these basic rules will drastically reduce the
performance and increase the noise levels of the extractor hood.