Clean Air Optima CA-509Pro Smart Gebrauchsanweisung Seite 18

How to use (Filter installation for the front and the back)
1. Disassemble the panel
Press on the red indicated icon
on the left and right side on the
air purifier with both fingers, see
figure. Pull the panel towards you
like indicated by the blue arrows.
3. Install the Pre-filter
Install the Pre-filter with the black
bulge outward. Put its lower part
into the bottom slot and push
the top (with the arrows on it)
gently into the upper slot.
The device needs to be positioned at least 30 cm from walls and furniture to obtain a good
air flow. Make sure that the air in-and outlets are not blocked.
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2. Install the composite filter
Remove the sealing from
the filters. Place the filters
back into the device. The tap
on the bottum and the top must
be visible at the front (The HEPA
side from the filter is visible).
4. Install the panel
Push the front panel parallel along
the upper and lower edges in the
direction shown in blue, see figure.
When you are hearing a click,
then the panel is installed.