The Black&Decker HEPAFresh Air Cleaner tower is designed to help improve the quality of air in your home by reducing allergens and odors. The multi-layer filter captures up to 99% of airborne particles, such as dust mites, pollens, mold spores and pet dander; while the carbon layer reduces common smoke, cooking and pet odors. It is designed with a pre-layer to capture large dust particles, extending the life of the filter. The 22" tower is effective for filtering the air in medium sized rooms and offers 3 fan speeds depending on your needs.