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• Thenationaldecreeonfuel-burningsystemsspecifies a maximum
depression of 0.04 bar 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
toventilationductsforroomsinwhichfuel-burningappliancesare
installed.
• Itisadvisabletoapplyforauthorizationfromtherelevantcontrolling
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
bytherelevantauthorities.
• When the unit is used in its extractor version, a sufficiently large
ventilationholemustbeprovided,withdimensionsthatare
approximately the same as the outlet hole.
• Nationalandregionalbuildingregulationsimposeanumberof
restrictionsonusinghoodsandfuel-burningappliancesconnectedto
a chimney, such as coal or oil room-heaters and gas fires, in the
sameroom.
• Hoods can only be used safely with appliances connected to a
chimneyiftheroomand/orflat(air/environmentcombination)is
ventilatedfromoutsideusingasuitableventilationholeapproximately
500-600cm2 largetoavoid the possibility of a depression being
createdduringoperationofthehood.
• Ifyouhaveanydoubts,contactthe relevant controlling authority or
buildinginspector’soffice.
• 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 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
safelyin the above conditions without the need for any of the
aforementionedmeasures.
• When the hood is used in its extractor function, the following rules
mustbefollowedtoobtainoptimaloperation:
— 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
performanceandincreasethenoiselevelsoftheextractorhood.