The Lasko HF25620 Pure Gold Slim Profile Air Purifier with fresh air ionizer features a 3-stage filtration system ideal for fresher cleaner air. The carbon filter removes smoke plus cooking and household odors. It also captures dust pet hair and other large particles. Effective up to four months the carbon filter extends the life of the HEPA filter. The VOC filter removes airborne volatile organic compounds and is effective up to 12 months. It captures odors and fumes from cleaners aerosols carpet and paint. The HEPA filter removes 99% of airborne irritants as small as 0.3 microns and is also effective up to 12 months. With a space-saving slim-profile design the Pure Gold Air Purifier is perfect for bedrooms living rooms and home offices up to 200 square feet.