United Mechanical, based in Dallas, is a mechanical contractor involved in projects, such as plumbing, welding, piping, sheet metal; heating, ventilation and air conditioning; and design and build services. The mechanical services include plumbing, metal fabrication, maintenance, controls, and service and installation. The company s preventive maintenance programs offer repair and replacement of water heaters, boilers, heat exchanger, plumbing fixtures, shower pans, gas piping, water piping, and sewer and drain lines. It also supplies materials, including pipe, flex, duct wrap, tape and duct sealer. The company is also involved in specialty fabrication, including fiberglass, plastics, sheet metal, structural steel and structural aluminum.