COMMERCIAL METAL FABRICATION & HVAC DUCT
JMC Fabrication is the Gulf Coast's commercial HVAC duct and metal fabrication partner for general contractors, mechanical subcontractors, and EPC firms on large-scale commercial projects. SMACNA-compliant fabrication. In-house Revit BIM engineering. 50,000 sq ft of production capacity in Pascagoula, MS. We supply at the scale and documentation level that Tier 1 commercial contractors require.
Commercial HVAC duct is JMC's highest-volume commercial product and our primary growth focus. We produce:
- SMACNA-compliant galvanized steel duct (rectangular, round, oval, all classes)
- High-volume production capacity for large commercial mechanical packages
- Revit BIM engineering coordination — work from GC or mechanical sub Revit models
- Southeast delivery reach that keeps freight economics practical for commercial duct buyers
Duct is bulky. Sourcing it regionally from JMC's Pascagoula shop rather than from out-of-state suppliers saves significant freight cost on large commercial packages — a real economic advantage for Gulf Coast and Southeast buyers.
JMC's in-house engineering team plugs directly into the commercial project coordination process:
- Revit BIM clash detection and drawing review against customer models
- Shop drawings generated from customer packages or JMC-drafted in-house
- RFI support for GC and mechanical engineer coordination
- Duct layout review and optimization before fabrication begins
Beyond duct, JMC's fabrication shop supports broader commercial project needs:
- Structural steel components, frames, and assemblies
- Penetrations, sleeves, and structural supports
- Custom sheet metal work for architectural and utility applications
- Equipment packages and subbases
- Shop-fabricated duct and metal for faster field installation and lower field labor
- SMACNA and AWS certified — required by most commercial mechanical specifications
- Consistent quality and documentation across large, multi-phase projects
- Pascagoula-based: Southeast delivery advantage for commercial duct
- In-house engineering reduces coordination friction with GC teams
JMC operates a 50,000 sq ft facility in Pascagoula, MS with in-house engineering, fabrication, quality inspection, and delivery coordination. The shop is sized for large commercial packages and scalable for multi-phase projects.
- 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.
- September 24, 2026Which Stainless Steel Grades Can Be Fabricated and Welded? 304, 316, 420, and 440 ComparedNot every stainless steel welds the same. How 304 and 316 compare with ferritic, duplex, and martensitic grades like 420 and 440, and what to expect when a drawing calls for a hard-to-weld grade.
- September 24, 2026How Do You Design a Steel Fabrication for Hot-Dip Galvanizing?Hot-dip galvanizing works best when the fabrication is designed for it. Vent and drain holes, overlapping surfaces, kettle size, distortion, surface prep, and what to do about welding after galvanizing.
- September 2, 2026How Much Lighter Is Aluminum Than Steel for Fabrication?Aluminum weighs roughly a third of steel for the same volume. What that actually means for a fabrication project, and when the weight difference is worth the higher material cost.
- September 2, 2026What Tolerances Should You Expect from a Structural Steel Fabricator?Real AISC-standard tolerances for structural steel fabrication: mill tolerances, camber and sweep, column length, and connection hole alignment, and why erection problems usually trace back to tolerance stacking.
- September 2, 2026What Aluminum Alloy Should You Use for Marine and Coastal Fabrication?5052, 5083, 6061, or 6063: which aluminum alloy actually fits a marine hull, a coastal structure, or an architectural piece, and why the wrong choice shows up as corrosion years later.
- September 2, 2026What Is an MTR? Material Test Reports and CMTRs ExplainedAn MTR is the mill's certified record of a material's chemistry and mechanical properties, tied to a heat number. Here's what's actually in one, and when a project needs full heat-level traceability versus a basic mill cert.
- 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.
- August 19, 2026Specialty Weldments: What They Are and When You Need Custom FabricationWhat separates a specialty weldment from a standard fabricated part, when a project actually needs custom weldment fabrication, and what to give a shop to get an accurate quote.
- August 19, 2026Wall and Deck Penetration Fabrication for Marine and Industrial ProjectsHow structural and pipe penetrations are fabricated for marine bulkheads, decks, and industrial walls, what information a fabricator needs, and why fit matters more than it looks.
- August 19, 2026Pump Skid Design and Fabrication: What's Included and How It's BuiltWhat goes into a fabricated pump skid, how the build process works from drawings to delivery, and what to include in an RFQ to get an accurate quote.
- 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.
- 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.
- FabricationDuct Fabrication by IndustryHow duct requirements change across commercial, marine, and industrial work, and how JMC Fabrication builds for each from one Gulf Coast shop.
Fabrication services built specifically for commercial work:
- Commercial HVAC Duct FabricationSMACNA-compliant commercial HVAC duct fabrication from Pascagoula, MS. Rectangular, round, and oval duct in all classes, Revit BIM coordination, and Southeast freight economics for GCs and mechanical subs.
- Commercial Custom Metal FabricationCommercial custom metal fabrication from Pascagoula, MS. Structural supports, equipment platforms, and miscellaneous metals for GCs and mechanical subs, with Revit BIM coordination and Southeast delivery.
- Commercial Galvanized Steel FabricationCommercial galvanized steel fabrication from Pascagoula, MS. SMACNA-compliant galvanized HVAC duct and galvanized components for GCs and mechanical subs, with Revit BIM coordination and Southeast delivery.
Services most often specified for commercial projects:
- 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.
- Galvanized Steel FabricationSMACNA-compliant galvanized steel duct, sheet metal, and custom components from Pascagoula, MS. Corrosion-resistant fabrication for commercial HVAC and industrial applications.
- 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.
Does JMC Fabrication produce SMACNA-compliant HVAC duct for commercial projects?
Yes. JMC fabricates commercial HVAC duct in compliance with SMACNA standards, including proper gauge selection, seam types, and reinforcement per duct class and static pressure rating. SMACNA compliance is a baseline requirement on virtually all commercial mechanical specifications.
Can JMC coordinate with our mechanical engineer or Revit model?
Yes. JMC has in-house CAD/CAM engineering with Revit BIM modeling capability. We can review and clash-check against your mechanical model, generate shop drawings, and provide RFI support throughout the project.
Does JMC provide certified documentation for commercial fabrication projects?
Yes. JMC provides inspection records and documentation packages for commercial projects that require quality sign-off. AWS certification and SMACNA compliance are documented per project.
What commercial project sizes does JMC typically handle?
JMC's 50,000 sq ft Pascagoula facility is sized for large commercial duct packages. Contact JMC with your project scope and timeline — we'll confirm capacity and lead time.
Why source commercial duct from a Gulf Coast fabricator instead of a national supplier?
Duct is bulky — freight costs are a real factor on large commercial packages. Sourcing regionally from JMC's Pascagoula shop keeps freight costs down for Gulf Coast and Southeast buyers while delivering the same SMACNA compliance and documentation you'd expect from a national supplier.