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a chimney if the room and/or flat (air/environment combina-
tion) 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 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
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 (150 mm Ø min.).
●
Failure to observe these basic rules will drastically reduce the
performance and increase the noise levels of the extractor
hood.
