The Element Air Wall Unit Air Purification Systems utilizes a UV light core enhanced by a hydrated metallic compound target to produce advanced oxidation process consisting of hydro-peroxides, super oxide ions and hydroxides to continuously cleanse the air and help in the reduction of particulates. It effectively destroys and reduces airborne pollutants, bacteria, viruses, mold and odors from mold, mildew, sewage, smoke and fuel. The commercial grade exterior housing of brushed aluminum gives it a high-end look while also being durable in wet applications and its compact design is suitable for smaller spaces. On/off switch with low, high and off settings. The 12 inch unit is good for 160 sq. ft., XL unit is good for 200 sq. ft and XLD unit is good for 240 sq. ft. They all operate at 100 - 277V AC.