The Blue Pure 311 Auto air purifier takes a simple approach to air quality management with an integrated particle sensor, Auto mode setting, and LED air quality display. Independently evaluated for performance by the AHAM Verifide® Program for a Clean Air Delivery Rate of 250 for fine smoke particles, 250 for pollen particles, and 244 for dust particles. Best for medium rooms like a master bedroom, living room, or playroom with a 360° air intake to filter room air about every 12.5 minutes (about 4.8x an hour at 388 ft²) on high. The 3-step filter works with HEPASilent™ filtration technology to remove 99.97% of airborne particles down to 0.1 microns, like pollen, dust, pet dander, mold, bacteria, viruses⁰, and more, while a layer of activated coconut carbon traps light household odors. Features a 3-color LED air quality display and one-touch enabled Auto mode setting to auto-adjust to real-time conditions. Noise levels equivalent to a whisper on low (23-53 dB), and ENERGY STAR certified energy efficiency (3-35 W). Change color with five fabric pre-filters inspired by Scandinavian nature. Pre-filter in Arctic Trail (gray) included; Additional colors sold separately. All Blueair purifiers are AHAM Verifide® for Clean Air Delivery Rate and recommended room size, ENERGY STAR certified, and tested by the California EPA Air Resources Board (CARB) for safe ozone emissions. ⁰This air purifier has not been tested against Coronavirus, and Blueair does not claim to capture, remove, or kill 2019-nCoV.