It is recommended to clean the air filters in the LG CT Air Conditioning Ceiling Cassette at least once every two to four weeks, depending on the usage and the environment. If the unit is used in a dusty area or if there are pets in the home, the filters may require more frequent cleaning. To clean the filters, turn off the unit, remove the filters, gently wash them with warm, soapy water, and allow them to air dry before reinstalling. Replace the filters if they are damaged or excessively dirty. Regular cleaning and maintenance will ensure optimal air quality and efficient operation of the air conditioning unit.