Founded in 1904 during Oklahoma’s oil boom, Southern Sheet Metal Works Inc. is a Tulsa-based, family-owned manufacturer of custom sheet-metal fabrications and HVAC ductwork. Now in its fifth generation of Tidwell family ownership, the company has grown from an early oil-field supplier into a custom manufacturer handling everything from prototypes to industrial ventilation systems. Its Southern Safe Rooms division, launched in 2011, builds Tulsa-fabricated storm shelters certified to withstand an EF5 tornado.
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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
Seneca Sheet Metal CompanyFamily-owned since its 1964 opening, Seneca Sheet Metal Company has built its identity around dependable custom fabrication in Northwest Ohio. Known especially for industrial ventilation, the company serves customers ranging from independent proprietors to major engineering firms, taking projects from prototypes through long-running production work.TIFFIN, OH
Southerntier Custom Fabricators, IncSoutherntier Custom Fabricators is a second-generation family business founded in Elmira in 1982, making sheet metal fabrications and air handling systems for commercial and industrial customers. It moved to its larger Elmira facility in 2002 and operates a fully automated facility of more than 60,000 square feet. The company is particularly focused on custom fabrication and HVAC air-handling work.ELMIRA, NY
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