Southwark Metal Mfg. Co. has been manufacturing prefabricated sheet metal ducts and fittings for over 70 years. Third generation family ownership and a highly dedicated management staff are committed to providing its distributors with the finest quality products. Southwark was founded in 1946 and is still proud to be a private, family owned company. With six state of the art manufacturing facilities, it has grown to be one of the largest duct manufacturers in the United States.