This Swiss-engineered air purifier senses the level of pollution in a room and adjusts its fan speed accordingly. Developed by a 60-year-old family-owned business in Widnau, Switzerland, it has a particle sensor that constantly analyzes the passing air stream and automatically boosts the fan’s speed when it detects an increase in airborne impurities. Its washable pre-filter traps dust and pet hair, while a carbon filter absorbs odors and harmful gases, and a HEPA filter captures 99.97% of particles larger than 0.3 microns including pollen, dust mites, mold, and pet dander. It purifies the air in a room up to 720' sq. and has whisper-quiet operation. With a sleep mode, 1-19 hour timer, and power boost option. Includes remote. 25 1/2" H x 17 3/4" W x 8 3/4" D. (20 lbs.)