Germ Guardian True HEPA Filter Air Purifier for Home, Office, Bedrooms, Filters Allergies, Pollen, Smoke, Dust, Pet Dander, UV-C Sanitizer Eliminates Germs, Mold, Odors, Quiet 22 inch 3-in-1 AC4825 Used Needs A Little Clean Up Smoke Free 3 in 1 air purifier for home true hepa air filter reduces up to 99.97% of harmful germs, dust, pollen, pet dander, mold spores, and other allergens as small as .3 microns from the air Kills germs uv c light helps kill airborne viruses such as influenza, staph, rhinovirus, and works with titanium dioxide to reduce volatile organic compounds Traps allergens pre filter traps dust, pet hair, and other large particles while extending the life of the HEPA filter Reduces odors ACtivated charcoal filter helps to reduce unwanted odors from pets, smoke, cooking fumes, and more Quiet operation the lowest setting can be used as gentle white noise at night for a quiet, restful sleep Settings choose between 3 speed settings and an optional uv c light Room size: 22 inch purifier filters air 4x per hour at max speed in medium to large rooms up to 167 sq. Feet; cadr rating: dust (118) pollen (125) and smoke (108) Genuine replacements only use genuine germguardian replacement parts to maintain performance Replacements replace the filter every 6 to 8 months and the uv c bulb every 10 to 12 months; filters: germ guardian filter b (model flt4825) or a 4 pack of germ guardian carbon filters (model flt22cb4); uv c bulb: model lb4000 Aham verified & energy star certified this air purifier was rated for its ability to filter tobacco smoke, dust, and pollen from rooms and be energy star certified and carb compliant