United McGill Corporation was founded in 1951 as a local sheet metal contractor and steel fabricator. Today it is a national business specializing in engineering, manufacturing, and field installation of many construction products and industrial systems. United McGill is a family owned company with about 500 associates and annual sales of approximately $60 million. Headquartered in central Ohio, we operate nine manufacturing plants, over 40 sales engineering offices, and Duct Express™ outlets throughout the United States.