CSM-Fab, Inc. is a family-owned manufacturer of rectangular HVAC duct and fittings, founded in 1980 by Lee Vance. The company grew from sheet-metal roofing and architectural-metal work into ductwork manufacturing, with stated production capacity of 15,000 pounds per day on a single shift. It also provides industrial field maintenance and emergency welding, drawing on a crew with more than 75 years of combined field experience.
AWS Certified
AWS
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Hennemuth Metal FabricatorsHennemuth Metal Fabricators is a family-owned and operated ductwork manufacturer and distributor founded in 1954 by Gordon Hennemuth. Based in Oakdale, Pennsylvania, the company fabricates custom duct and fittings for commercial and residential HVAC contractors, with in-house spiral and rectangular duct production. Its 60,000-square-foot fabrication shop opened in 2018, and the business reports more than 100 years of combined staff experience.OAKDALE, PA
Southwark Metal Manufacturing CoFounded in 1946, Southwark Metal Manufacturing is a third-generation family-owned company that makes sheet-metal ductwork for residential and light-commercial HVAC systems. It operates seven U.S. facilities and describes itself as one of the largest manufacturers in this specialty, with more than 3,000 stock items and custom fittings produced for wholesale distributors.PHILADELPHIA, PA
J&I Duct FabJ&I Duct Fab is a first-generation, family-owned company founded by Gerald Miller after more than four decades in the mechanical and HVAC industry. Based in Covington, Ohio, the company employs approximately 20 people and is now led day to day by second-generation President Hannah Murray, while Miller remains CEO. Its faith-driven, employee-centered culture also extends into J&I Gives, a program launched in 2023 to support local communities and missions.COVINGTON, OH
Hugee CorporationHugee Corporation is a family-owned HVAC contractor serving residential, commercial, industrial, and construction customers in the Washington, D.C. metropolitan area. Its physical production capabilities include custom sheet-metal and duct fabrication, while its broader offerings include heating, cooling, commercial refrigeration, indoor air quality, HVAC equipment sales, installation, repair, and maintenance.HYATTSVILLE, MD