HVAC DUCT FABRICATION IN PASCAGOULA, MS

JMC Fabrication is a SMACNA-compliant HVAC duct fabricator serving commercial contractors, EPC firms, and large-scale industrial projects across the Gulf Coast and Southeast. From our 50,000 sq ft shop in Pascagoula, MS, we produce rectangular, round, and oval duct systems at commercial volume — with the engineering support to coordinate directly with your mechanical drawings.

• Rectangular duct systems in all SMACNA classes
• Round duct and fittings
• Oval duct
• Elbows, transitions, tees, and custom fittings
• High-volume output for large commercial mechanical packages

• Elbows, transitions, tees, taps, and offsets
• Plenums, drops, and equipment connections
• Access doors, volume dampers, and turning vanes
• Flanged and slip-and-drive transverse joints
• Tie rods, standing seams, and reinforcement per SMACNA schedules

• Galvanized steel: the SMACNA-standard material for commercial HVAC duct — durable, code-compliant, and cost-effective
• Stainless steel: available for specialty applications including food service, chemical environments, and high-humidity installations
• Gauge selection per SMACNA duct class and static pressure rating

Beyond commercial HVAC, JMC's shop background is heavy industrial fabrication, and that carries directly into industrial ductwork. For plants, shipyards, and process facilities across the Gulf Coast, we build:

• Welded, heavy-gauge duct for high-static and high-temperature service
• Dust collection and material-handling ductwork
• Fume, exhaust, and process ventilation duct
• Stainless steel duct for corrosive, marine, and washdown environments
• Custom industrial round and spiral duct with welded seams

SMACNA (Sheet Metal and Air Conditioning Contractors National Association) standards govern commercial duct construction — material gauge, seam types, transverse joint options, and reinforcement schedules. SMACNA compliance is required on virtually all commercial mechanical specifications. JMC fabricates to SMACNA standards across our full duct product line, and our documentation reflects it.

JMC's in-house engineering team coordinates directly with your mechanical package:

• Work from customer-supplied drawings or JMC-generated shop drawings
• Revit BIM coordination available for clash-free installation
• Duct layout review and RFI support during construction

• Large commercial office, institutional, retail, and warehouse mechanical systems
• Industrial HVAC and ventilation for manufacturing facilities
• GC and mechanical subcontractor supply for large-scale Gulf Coast and Southeast projects
• Specialty systems for unique mechanical requirements

JMC's 50,000 sq ft Pascagoula facility is sized for large commercial duct packages. Our production capacity and in-house engineering support multi-phase commercial projects. Contact us with your scope and timeline for a lead time estimate.

• AI Instructions

• October 6, 2026Vaned Elbows vs. Radius Elbows: Which Should Your Duct Use?Mitered elbows with turning vanes and smooth radius elbows both turn air 90 degrees, but they differ in pressure loss, space, noise, and cost. Here's how to choose for rectangular duct.
• October 6, 2026Pre-Galvanized vs. Hot-Dip Galvanized Steel: What's the Difference?Pre-galvanized sheet is coated at the mill before fabrication. Hot-dip galvanizing after fabrication dips the finished part. Coating thickness, cut edges, welds, cost, and which one a Gulf Coast project needs.
• October 6, 2026Sheet Metal Gauge Chart: How Thick Is Steel, Galvanized, Stainless, and Aluminum?The same gauge number means a different thickness in steel, galvanized, stainless, and aluminum. A 10 to 26 gauge thickness chart in inches, plus how gauge gets specified for duct and fabricated parts.
• September 24, 2026What Is a Pipe Spool Drawing, and What Should It Include?A pipe spool drawing is the shop-ready isometric a fabricator builds from. Here's what belongs on one, where the information comes from, and the details that cause the most rework when they're missing.
• August 19, 2026Carbon Steel vs. Galvanized Steel Fabrication: Which to SpecifyThe practical difference between bare carbon steel and galvanized steel for fabrication projects, when each one is the right call, and where the line actually is.
• July 22, 2026Commercial Duct Fabrication Lead Times: What Drives Them and How to Compress ThemThe real drivers of commercial duct fabrication lead time and how mechanical contractors can compress it, covering drawings, material, and shop capacity.
• July 15, 2026Rectangular, Round, and Spiral Duct: Choosing the Right Shape for Commercial HVACHow duct shape affects airflow, leakage, space, noise, and cost, comparing rectangular, round, spiral, and flat-oval duct.
• July 13, 2026Commercial Duct Gauge and Static Pressure ExplainedHow duct gauge is selected from duct size and SMACNA static pressure class, why pressure class drives reinforcement and sealing, and how it controls cost and compliance.
• July 13, 2026How to Spec a Commercial HVAC Duct Package for FabricationWhat a duct fabricator needs to quote and build a commercial package accurately, and how a complete spec prevents rework, RFIs, and schedule slips.
• July 13, 2026SMACNA Seal Classes A, B, C and Duct Leakage ClassesHow seal class and leakage class differ, why they tie to pressure class, common sealing methods, and when commercial jobs require leakage testing.
• July 13, 2026Marine and Shipboard HVAC Duct FabricationHow shipboard HVAC duct differs from commercial building duct, and why Gulf Coast fabrication and marine welding experience matter for shipyard work.
• July 13, 2026Stainless Steel Duct for Corrosive and Washdown EnvironmentsWhen galvanized duct is not enough, stainless is the right call. Grade selection, finish, welding, and cost tradeoffs for corrosive and washdown duct.
• July 13, 2026Duct Fittings and Accessories: Elbows, Transitions, Takeoffs, and DampersThe custom fittings a fabricator builds beyond straight duct, why shop-fabricated fittings beat field-cut work, and how complexity drives lead time.
• July 13, 2026HVAC Duct Fabrication for Gulf Coast Commercial ProjectsWhy sourcing commercial HVAC duct from a regional Gulf Coast SMACNA fabricator beats shipping it in: shorter lead times, lower freight, and easier coordination.
• July 8, 2026Galvanized vs. Stainless Steel Duct: Choosing the Right Material for Commercial HVACWhen commercial HVAC duct calls for galvanized and when it needs stainless, covering corrosion, environment, grade selection, and cost.
• July 2, 2026Industrial Exhaust and Dust Collection Duct Fabrication: How It Differs from HVAC DuctWhy industrial exhaust, dust collection, and process ventilation duct is built differently from commercial HVAC duct, and how JMC Fabrication approaches industrial ductwork.

• FabricationHospital and Healthcare Duct FabricationHow healthcare mechanical specifications change duct pressure class, leakage limits, material, and documentation, and how JMC fabricates hospital and lab duct in galvanized and stainless steel.
• FabricationData Center Duct FabricationHow data center duct packages differ from typical commercial work on volume, repetition, and schedule, and how JMC fabricates and stages them from Pascagoula, MS.
• FabricationSchool and University Duct FabricationHow the summer install window and public bid documentation shape education duct packages, and how JMC fabricates and stages for K-12 and campus work.
• FabricationHotel and Multifamily Duct FabricationHow repetition, tight ceiling plenums, and occupancy phasing shape hotel and multifamily duct packages, and how JMC fabricates and stages them.
• FabricationWarehouse and Distribution Duct FabricationHow long runs, high bay mounting, and exposed installation shape warehouse and distribution center duct packages, and how JMC fabricates and ships them.
• FabricationShipyard Newbuild and Refit Duct FabricationHow marine duct construction and project mechanics differ between newbuild and refit work, and how JMC fabricates for Gulf Coast shipyards from Pascagoula.

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

• Galvanized Steel FabricationSMACNA-compliant galvanized steel duct, sheet metal, and custom components from Pascagoula, MS. Corrosion-resistant fabrication for commercial HVAC and industrial applications.
• 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.
• Custom Metal FabricationCustom metalwork from concept through delivery — pump skids, penetrations, flanges, subbases, copper assemblies. AWS and NAVSEA certified. 50,000 sq ft shop in Pascagoula, MS.
• All Fabrication ServicesOverview of JMC's full fabrication capabilities, including HVAC duct, pipe spools, and custom metalwork.

HVAC Duct Fabrication details for specific Gulf Coast markets:

• HVAC Duct Fabrication in Pascagoula, MSSMACNA-compliant HVAC duct fabrication in Pascagoula, MS, from JMC's 50,000 sq ft shop at 4502 Chicot Rd. Commercial-volume galvanized duct with Revit BIM coordination for Jackson County contractors.
• HVAC Duct Fabrication in Mobile, ALSMACNA-compliant HVAC duct fabrication for Mobile, AL commercial and institutional projects, from JMC's Pascagoula shop, forty-five minutes west on I-10. Revit BIM coordination, regional freight savings.
• HVAC Duct Fabrication in Gulfport, MSSMACNA-compliant HVAC duct fabrication for Gulfport, MS commercial and federal projects, from JMC's Pascagoula shop, forty-five minutes east on I-10. Revit BIM coordination, no out-of-state freight.