The Therapure line of air purifiers is the only line with triple action purification a uniquely engineered cleanable HEPA-type filter helps remove particles from the air, and in combination with UV light helps reduce certain viruses and bacteria. The ionizer helps improve the filter efficiency as well as clumping airborne particles together so they can be cleaned up more easily with other household dust.Find the AIR PURIFIER HEPA 120V at Ace.