DeLonghi 0 AC230 Energy Star Air Purifier with Ionizer, 220 Square Feet, White/Gray AHAM certified for rooms up to 220 sq. ft. (CADR: 144) AQS air quality system uses a unique lighted sensor system to give visible feedback on room's air quality 6 layers of filtration include pre-filter, HEPA filter, active carbon filter, NANO silver filter, photo catalytic filter with UVC lamp and ionizer Cleans the air and removes impurities down to a size of 0.3 microns including dust, pollen, cigarette smoke and car exhaust fumes Sensor touch LED control panel with Ionizer on/off function, 3 fan speeds, timer (1, 3, 4 or 8 hours) and filter indicator