The PureGuardian Air Cleaner tower is designed to help improve the quality of air in your home by reducing allergens and odors. The allergen filter captures airborne particles, such as dust mites, pollens, smoke and pet dander; while the carbon layer reduces common smoke, cooking and pet odors and captures large dust particles, extending the life of the filter. The 22 inch tower is effective for filtering the air in rooms up to 186 sq. feet and offers 3 fan speeds depending on your needs. Uses GENUINE GermGuardian HEPA replacement filter FLT4825.