Product Detail In rooms as large as 679 square feet, the patented three-stage HEPASilent technology captures 99.97% down to 0.1 micron in size. Airflow rate: 88 to 490 CFM Low energy consumption: 35 to 120 watts Energy Star listed 3 easy-to-change filters 3-stage HEPASilent technology captures 99.97% of 0.1 micron particles, including pollen, dust mites, mold spores and pet dander Ion brushes (no ozone generated). CADR Certified Rating for rooms up to 679 square feet: Smoke 438 / dust 400 / pollen 450 Air exchange: 6 air changes per hour (679 sq ft room). Filters are made of bacteria-resistant, waterproof polypropylene 4 speed control knob AHAM certified Airflow output on three sides to avoid draft. Noise level: 32 to 68 dB (A) . The "Blueair HepaSilent 610B Air Purification System with Bonus filter" is best product for you. We recommended Blueair HepaSilent 610B Air Purification System with Bonus filter