Performance you can trust; Independently evaluated and third-party tested for performance as part of the AHAM Verifide Program for room air cleanersRecommended for medium rooms, completely filters air in master bedroom, living room or playroom about every 12.5 mins (4.8x an hour at 388 square feet) on highCombination filter; Carbon traps light particles; HEPASilent technology removes 99.97% of airborne particles down to 0.1 micron, like Pollen, Dust, and Viruses⁰Intuitive Auto mode; Automatically adjusts to real-time conditions reported by the particle sensor to maintain a comfortable home environmentLow noise and energy; Cleans the air with noise levels equivalent to a soft whisper on low (23-53 dB) and ENERGY STAR rated energy efficiency (7-35 W)Customize freely, washable fabric pre-filter in Arctic Trail (gray) included, Additional pre-filter colors inspired by Scandinavian nature sold separately