The convenient Check Filter Indicator reminds you when it might be time for a new filter. Keep airborne contaminants out of your home with the Core 300 Air Purifier. The Pre-Filter captures large particles like lint and hair. The Main Filter captures at least 99.97% of airborne particles down to 0.3-microns in size. The High-Efficiency Activated Carbon Filter with ARC Formula adsorbs odors and VOCs. The air purifier uses VortexAir Technology’s spiral 360° airflow to quickly refresh air in a medium-sized room such as a kitchen or living room.