The Honeywell Air Genius 5 Air Purifier features 5 levels of cleaning power and 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 and larger such as dust, pollen, pet dander, dust mite debris and smoke. Permanent washable ifD filter and foam pre-filter for easy maintenance.