Since 1966, Cincinnati-based Langdon, Inc. has fabricated sheet-metal ductwork and related components from its 50,000-square-foot facility. The company stands out for its patented duct connections and products such as Sure•Clamp™ Access, a removable duct section designed to simplify fire-damper inspection and maintenance. Its engineering and estimating teams also develop custom applications for commercial and industrial projects.
NFPA 80 (2013) Compliance
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SMACNA Standards
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Metro Duct Systems, IncFor more than five decades, Metro Duct Systems, Inc. has designed and fabricated custom ductwork for commercial and residential clients across the tri-state area and New Jersey. Based in Long Island City, the company also handles ductwork installation and as-built drawings, bringing its sheet-metal expertise to projects that require tailored fabrication.ASTORIA, NY
The Ductworks IncBased in the Pittsburgh area, The Ductworks Inc. fabricates custom rectangular galvanized-steel ductwork and fittings for light commercial and residential HVAC systems. The shop works with HVAC contractors from blueprint takeoffs through job-site delivery, hand-crafting duct to reduce noise and friction while improving airflow and limiting leaks. Its experienced team also supports residential changeouts with custom plenums and boots.MONROEVILLE, PA
Hranec CorpFounded by Steve Hranec in 1995, Uniontown-based Hranec Corp. combines mechanical construction services with large-scale HVAC manufacturing, including custom ductwork and roof products. Its manufacturing operation has expanded from a 2008 fabrication facility to a 40,000-square-foot roof-product shop and a 200,000-square-foot building completed in 2026. Hranec also stands apart with specialized offerings such as outdoor Tuff Duct and its patented Spiral Graphix, which turns exposed spiral ductwork into customized visual displays.UNIONTOWN, PA