United McGill Corporation, founded in 1951, is a national business specializing in engineering, manufacturing, and field installation of construction products and industrial systems. The company operates five subsidiaries, including McGill AirClean, providing air pollution control solutions; McGill AirFlow, a leading manufacturer of HVAC ductwork; McGill AirPressure, offering pressure processing equipment; McGill AirSilence, providing noise control solutions; and McGill AirSeal, offering sealants and adhesives for HVAC and ductwork applications.