Founded in 1965, Circulating Air provides mechanical engineering solutions and in-house and contractor services. The company serves school projects, public works, residential projects, hotel conversions and government projects. It also offers contractor services to private and public industries and markets. The company operates engineering and drafting department. It also has a service department that offers mechanical contracting and engineering, air conditioning, heating, piping, and sheet metal and electrical services. Circulating Air operates in North Hollywood, Calif. It also has a satellite office in Lancaster, Calif. The company employs over 125 people.