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Mounting and Installation
Notes on the exhaust air ducting to the air outlet
ATTENTION!
Risk of malfunction and damage!
An inadequately constructed, unfavourably routed
or shaped exhaust air line can significantly impair
the function of the appliance!
Follow the instructions in this section carefully,
to avoid problems such as reduced extraction perfor-
mance, noise development or increased running noise,
grease deposits or condensate formation!
Make sure that the following conditions for proper
exhaust air ducting up to the air outlet can be guaranteed:
• The entire exhaust air pipe must be made of non-combustible
material and must not be routed through a duct together with
gas or hot air pipes or similar.
• The diameter of the exhaust air duct must match that of the
shaft supplied and must not have any constrictions
or blockages (such as fly screens).
In the case of exhaust air ducting through a wall box,
this should have movable lamellas.
• The exhaust air duct should be rounded in shape, have smooth
inner surfaces and be routed away from the extractor fan as
straight as possible. The maximum permissible bend is 120°.
• Ensure that any backflow flaps that may be present can open
and close freely after the exhaust air duct has been installed.
• All connections must be sealed.
• If the exhaust air duct is laid horizontally, a minimum gradient
of 1 cm per metre or an angle of inclination of 2° must be
maintained in order to avoid the return of condensation water.
• If the exhaust air duct is routed through unheated or cool
rooms (e.g. attics), it must be insulated to prevent additional
condensation.
An additional condensation water barrier may be necessary
(available in leading DIY stores).
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