AEG 825 D Installations- und Betriebsanleitung - Seite 8

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Regulations on fuel-burning systems specify 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

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

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.

Where flexible ducting is fitted the length should be no more

than:

— 3 metres with one 90° bend

— 2 metres with two 90° bends.

Bends of more than 90° will reduce the efficiency of the hood

and reduce the air flow.