HEPAClean UV Tower Air Purifier features an advanced air cleaning system that combines three powerful air cleaning technologies into one compact air purifier to deliver clean, fresh air to a 185 square foot room. Germ Fighting Ultraviolet Technology helps reduce viruses, bacteria, fungi and mold spores while the HEPAClean filters remove up to 99 percent of airborne particles such as dust, pet dander, smoke and pollen. Enhanced odor-control, carbon zeolite pre-filter helps reduce common household odors such as pet, cooking, nursery and smoke odors. Air purifier circulates and filters the air in your room up to five times every hour with whisper-quiet performance. Permanent filters never need replacing. Simply vacuum to clean when the filter gauge light indicates the filter is dirty. Air purifier offers up to 12 different cleaning power levels, a 1-18 hour auto shutoff timer, and sleek tower.