Spiral Duct Fabrication
Continuously spiral-formed round duct delivers cleaner airflow, lower friction loss, and a finished architectural look that flat-seam ductwork can't match. Built in-house by MPI Fabrication for mechanical contractors and design-build teams across the Southeast.
Why Spiral Duct, and Why MPI
Spiral duct is the round ductwork standard for exposed-ceiling commercial spaces, restaurants, retail buildouts, healthcare facilities, and high-end industrial environments where airflow efficiency and visible finish quality both matter. Round geometry moves air with less turbulence than rectangular duct, which means smaller equipment and quieter operation.
MPI Fabrication runs spiral duct as a signature high-end service — not an afterthought. Our shop fabricates spiral duct in galvanized, stainless steel, aluminum, and specialty alloys, with the full range of spiral fittings engineered to match: elbows, tees, reducers, taps, end caps, and custom transitions. Whether the duct is hidden above a hard lid or hung exposed as part of the building's design, the fabrication is held to the tolerances the install demands.
- Diameters from 3" through 60" — single source for an entire job
- Galvanized, stainless, aluminum, and specialty alloys including paint-grip
- Complete spiral fittings library: elbows, tees, wyes, reducers, taps, end caps
- Custom transitions, oval-to-round, and architectural shrouds on request
Applications We Fabricate For
MPI's spiral duct moves air in some of the most demanding commercial environments in the Southeast. We work directly from your submittal drawings, coordinate with your field crews on dimensional adjustments, and ship a labeled, install-ready package.
- Exposed-ceiling restaurants, retail, breweries, and tasting rooms
- Healthcare corridors, exam rooms, and ambulatory surgical centers
- K–12 and higher-ed campuses where aesthetic finish matters
- Architectural office buildouts and adaptive-reuse renovations
- Industrial dust collection and ventilation runs in manufacturing plants
- Hospitality, multi-family housing, and assembly venues
Spec to Fabrication, Streamlined
Send us a takeoff, drawings, or a marked-up submittal package. Our team reviews specs, flags any field-condition concerns, and confirms gauge, joint type, and finish before fabrication starts. From there, every part is spiral-formed, fitted, sealed if specified, and labeled to your sequence — no guesswork at install.
Standard MPI turnaround is 24–72 hours for stock spiral runs and most fittings. Larger custom packages are scheduled in coordination with your field calendar so the duct shows up exactly when you need it.
- SMACNA-standard joint and seam configurations
- Internal liner, double-wall, and pressed-fitting options available
- Project-by-project labeling and staging to match install sequence
- Delivery across Coastal Georgia, the Lowcountry, Northeast Florida, and Metro Atlanta
Frequently Asked Questions
Answers to what contractors most often ask before partnering with MPI Fabrication.
What diameters of spiral duct can MPI fabricate?
MPI Fabrication produces spiral duct in diameters from 3-inch through 60-inch in standard steps, with custom oval and rectangular-to-round transitions available on request.
Which materials does MPI offer for spiral duct?
Galvanized steel is our standard. We also fabricate spiral duct in stainless steel (304, 316), aluminum, and paint-grip galvanized for architectural exposed applications. Specialty alloys are available on a per-project basis.
Do you fabricate custom spiral fittings or just stock fittings?
Both. MPI keeps the full spiral fittings catalog — elbows, tees, wyes, reducers, taps, end caps — and we fabricate custom transitions, architectural shrouds, and one-off adapters from contractor drawings or field measurements.
What's MPI's typical turnaround for spiral duct?
Standard runs and most fittings ship within 24–72 hours of order confirmation. Larger custom packages are scheduled in coordination with your field install calendar.
Do you deliver spiral duct or do contractors pick up?
Both. MPI Fabrication delivers to job sites across Coastal Georgia, the South Carolina Lowcountry, Northeast Florida, and Metro Atlanta. Will-call pickup at our Richmond Hill, GA shop is available for nearby contractors.
Need a Fabrication Quote?
Upload drawings or specs and our team will price your project within 24 business hours.