SEMCO Duct & Acoustical Products is a wholly owned subsidiary of SEMCO Incorporated, which is a privately held corporation. It has a more than 60,000-square-foot production facility. The company's product lines include desiccant-based energy recovery wheels and systems, packaged ventilation and humidity control equipment, outdoor air systems, acoustic panels, sound attenuators, noise barriers and spirals and oval ducts. The company also offers construction and material handling services. In addition, the company operates several manufacturing facilities located in Crossville, Tenn.; Roanoke, Va.; Salisbury, Mo.; Morrilton and Petit Jean, Ark.; and Arlington, Texas. The company also conducts and organizes various stock programs. SEMCO Duct & Acoustical Products is located in Roanoke, Va.