Sunheat MA-4000 Mountainaire Six Stage Air Purifier Mountainaire Air Purification System. 6 Stage Purification Process. Purifies Up to 3,000 Sq Feet. Washable 1" HEPA Filter. Activated Carbon Deodorizer. Negative Ion Generator. UV bulb with Photo-Catalytic Ti02 Filter. Adjustable Fan Speed & Ozone Control. Ozone Plate Configuration for Optimal Purification. Remote Control. Retail Packaging. Three Year Warranty.