Depending on the installation site it is necessary to clean or replace the dust filter in both flaps. The dust filter should be replaced every 6 months.

1. Loosen the fastening screw which is used to fix the flap and open the flap.

   
   
   
   
   

2. Take the dust filter out of the flap.

3. Clean the dust filter or insert a new one (iba filter mat: order no. 43.000360).

4. Close the flap again and fasten the screw.