The AC350 Whole Room Air Purifier uses true HEPA filtration, the most effective filtration available, to remove up to 99.97 percent of airborne allergens down to 0.3 micron in size. The purifier actively circulates and filters all the air throughout a room. With powerful circulation, it uses a radial blower to intake and clean all the air in the room — up to 220 square feet. Precision engineering allows the blower to operate quietly, despite its powerful air flow. The purifier uses a combination of HEPA and carbon filtration to trap dust, pollen, pet dander, smoke, bacteria, mold spores, dust mites and more, while the carbon prefilter both adsorbs odors and traps larger particles. The purifier features three speeds, push button electronic controls, filter replacement indicator and industry leading 5-year limited warranty. CADR Ratings: dust – 152; pollen – 170; smoke – 142. Includes one True HEPA Filter and one Activated Carbon Prefilter. This product does not emit ozone. Dimensions: 17.7” H x 10.85” D x 13.2” W. Weight: 10.22 lbs. Power cord length: 6ft.