The Honeywell Air Genius 5 Air Purifier features 5 levels of cleaning power & a patented ifD advanced filtration system that provides exceptional air cleaning performance for large rooms up to 250 square feet. Filter helps capture microscopic airborne particles 0.3 microns & larger such as dust, pollen, pet dander, dust mite debris & smoke. Permanent washable ifD filter & foam pre-filter for easy maintenance. Air Cleaner Machine Type: IFD; CADR: 161; Maximum Room Size (Square Footage): 250 sq ft; Maximum Room Size: Large.