Fellowes Quiet Air Purifier with True HEPA Filter (AP-230PH) Air purity sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified True HEPA Filter safely removes 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, mold spores, dust mites, viruses, germs, pet dander, cigarette smoke and odors PlasmaTRUE Technology creates an ionized field to help safely remove airborne pollutants Purifies medium sized rooms up to 230 square feet Ultra quiet operation