Replacement AHPCO Cell for The 3,000 Sq. Ft. Filterless Silent UV Air Purifier Made for the 3,000 Sq. Ft. Filterless Silent UV Air Purifier (Item No. 202235) Uses the AHPCO technology (advanced hydration photo-catalytic oxidation) developed by NASA Reduces mold, fungi, bacteria, viruses, volatile organic compounds (VOCs) and other allergens Eliminates odors from smoke, pets, cleaning chemicals, mold and more