yuna DUANA Instruction Manual page 22

If the hood does not work properly and/or you can hear increased operating
Incorrect dimension of the air duct.
Obstruction in the air duct.
The diameter of the air duct from
hood to wall-box inclusive should be
120 mm; otherwise the capacity of
the motor may be decreased.
If you have installed a fly screen on
the wall-box, the air vent may be
obstructed. Check by removing the fly
screen.
If the cover panel of the wall box is
equipped with firm and slanted slats,
the air vent may be obstructed. Check
by removing the cover panel.
Install a cover panel with moveable
slats, which do not obstruct the air
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noise, check the schedule below:
vent.
Check condition and cleanliness of
the filters.
Check if the air which is extracted by
the hood is replaced to avoid negati-
vepressure.
When you run your appliance in re-
circulating mode, check if the carbon
filter has been replaced on time (min.
every 3-6 months).
If the appliance has a malfunction not
noted on the schedule or if you have
checked all items on the schedule
but the problem still exists, please
contact the shop you purchased the
appliance at.