GALVANIZED STEEL FABRICATION & DUCT WORK

Galvanized steel is the standard material for SMACNA-compliant commercial HVAC duct and a proven choice for corrosion-resistant sheet metal work. JMC Fabrication produces galvanized steel duct systems, enclosures, and custom components from our Pascagoula, MS shop — with the engineering and certification credentials that commercial contractors and EPC firms require.

Galvanizing bonds a zinc coating to carbon steel through a hot-dip process. The zinc provides sacrificial corrosion protection — it corrodes preferentially before the base steel, extending service life significantly in exposed or moisture-prone environments. Key advantages:

• Built-in corrosion protection — no additional painting required for most commercial applications
• SMACNA-specified standard material for commercial HVAC duct construction
• Significant cost advantage over stainless steel where full corrosion resistance is not needed
• Durable and field-proven in commercial and industrial environments

• Commercial HVAC duct systems (rectangular, round, and oval)
• Duct fittings, elbows, transitions, damper sleeves, and collars
• Sheet metal enclosures and access panels
• Structural covers, plenums, and custom sheet metal assemblies

JMC fabricates galvanized duct per SMACNA standards — gauge selection per duct class and static pressure, seam types, and transverse joint reinforcement options. SMACNA compliance is required on virtually all commercial mechanical specifications. Our documentation reflects compliance throughout.

All galvanized duct and sheet metal components receive visual inspection before delivery. Documentation is available per project requirement. AWS certified welding is applied to galvanized assemblies requiring structural welds — with proper procedure controls for galvanized material.

• Commercial HVAC mechanical systems — GC and mechanical subcontractor supply
• Industrial ventilation for manufacturing and warehouse
• Custom sheet metal enclosures and covers for commercial and industrial applications

Galvanized is the right call for standard HVAC environments, commercial duct, and any application where moderate corrosion protection is needed at commercial cost. Stainless is required for food service, chemical environments, marine saltwater exposure, and high-humidity corrosive conditions.

• May 13, 2026Carbon Steel vs. Stainless Steel Fabrication: Choosing the Right Material for Marine and Industrial ApplicationsHow carbon and stainless steel compare on corrosion, weldability, and cost, and how to choose between them for marine, oil and gas, and commercial HVAC fabrication.

Working on a project that combines services? Explore related capabilities at JMC:

• HVAC Duct FabricationSMACNA-compliant HVAC duct fabrication from Pascagoula, MS. Rectangular, round, and oval duct in galvanized and stainless steel. 50,000 sq ft facility serving the Gulf Coast.
• Stainless Steel FabricationNAVSEA and AWS certified stainless steel fabrication for marine, oil & gas, and specialty industrial applications. 304 and 316 stainless. Pascagoula, MS.
• Carbon Steel FabricationCarbon steel fabrication for pipe spools, HVAC duct, structural components, and custom weldments. ASTM A36, A53, A106. AWS certified welding from Pascagoula, MS.
• All Fabrication ServicesOverview of JMC's full fabrication capabilities, including HVAC duct, pipe spools, and custom metalwork.