Steril-Aire Inc.announced that it has filed suit against Dust Free for infringement of U.S. Patent Numbers 5,334,347; 5,817,276; 6,245,293; 6,267,924; 6,280,686; 6,313,470; and 6,627,000. This series of patents involves the application of UVC devices for coil and drain pan irradiation in HVAC systems, where they are used for mold, microbial and indoor air quality control. The lawsuit was filed on January 7, 2005 in the U.S. District Court for the Central District of California.