Industrial Environmental Systems, Inc. (IES) is a contract manufacturing firm that manufactures custom, industrial steel stacks and air pollution control equipment for light, utility power and industrial processes. We specialize in single wall stacks, dual wall stacks, steel stacks, fiberglass stacks, ductwork, structural steel, expansion joints, silencers, finite element analysis (FEA), and computational fluid dynamics (CFD). IES has offices in Atlanta, GA, Charlotte, NC, and Opelika, AL. Contracts are obtained on a competitive bid basis in response to customer supplied performance criteria and specifications. IES has more expertise and experience in designing tuned mass dampers (TMD) for steel stacks than anyone else in the United States.