Blueair Classic 403 HEPASilent Air Purification System, Allergy, Smoke and Dust Reducer, Medium to Large Rooms 365 sq. ft., White Designed for rooms up to 365 square feet and to fit beautifully into your home decor Highly efficient HEPASilent technology captures 99.97% of particles down to 0.1 microns Clean Air Delivery Rate (CADR) of 240 cubic feet per minute with five room air changes per hour Winner of Excellent Swedish Design award and a permanent spot in Stockholm's National Design Museum Includes a magnetic filter timer to alert you when the filter needs changing