TATUNG HF2001 Air Cleaner Filter for APS-2000T TURN OFF AND UNPLUG YOU AIR CLEANER LAY THE UNIT DOWN ON ITS BACK CHECK THE FILTER BY COMPARE THE FILTER TO THE COLOR CODED CHART ON THE INSIDE OF THE HOUSING WIPE OPENING OF FILTER REPLACEMENT AREA WITH A SOFT DRY CLEAN CLOTH RELOCATE THE AIR INTAKE GRILL ONTO UNIT, BE SURE THE GRILL IN PROPER POSITION