Custom Sheet Metal Fabrication: How Tailored Solutions Solve Complex Building Challenges

No two commercial buildings are the same, but standard duct and sheet metal components assume they are. If you’re dealing with tight ceiling cavities, unusual angles, specialty ventilation or a space with irregular dimensions, custom sheet metal fabrication is often the only way to get a solution that meets or exceeds your expectations.

Many general contractors, mechanical engineers, architects and facility managers know they need custom ductwork design but aren’t sure where to start. Howe is a dependable sheet metal contractor in South Dakota, a partner who can look at your plans, understand the constraints and fabricate and install components cleanly the first time.

Our team has supported commercial, industrial and institutional projects throughout South Dakota, Iowa, Minnesota, North Dakota and Nebraska since 1940. As a family-owned mechanical contractor offering in-house engineering, fabrication and installation, we will design a solution for your needs. Explore our full capabilities.

Custom sheet metal fabrication is the process of cutting, bending, forming and welding sheet metal so it matches your project’s exact specifications. We solve problems that standard, off-the-shelf components can’t address by building each part for the space where it will ultimately go. As part of our design-build mechanical capabilities, our engineers can review your plans and create components designed around your building’s constraints.

Our commercial sheet metal fabrication services cover everything from ductwork, fittings, transitions and plenums to brackets, hangers, structural pieces and decorative elements. For many projects, it’s the only way to get duct and sheet metal that fits tight ceiling cavities, unusual angles, specialty ventilation needs or exposed architectural designs.

Your building needs custom ductwork if your space, environment or airflow requirements don’t match off-the-shelf sizes. Standard parts assume every building is predictable, but commercial, industrial and institutional projects in SD, IA, MN, ND and NE rarely follow a template. Custom fabrication gives you code-compliant ductwork that consistently performs to your high standards.

When stock parts can’t make the turn, we fabricate components that do. Crowded ceiling cavities, packed mechanical rooms and structural obstacles can make ductwork challenging to route. Custom fabrication is the only way to get a proper fit if your project has beams, joists, equipment or architectural features that force unusual angles.

We’ll design and build ductwork around the daily realities you deal with. Our engineers will review your drawings, identify potential bottlenecks and create fittings, transitions and duct runs that work in tight areas without sacrificing airflow.

Historic properties that predate modern HVAC technology tend to have ceiling heights, chases and mechanical rooms that don’t match today’s standard duct sizes. Retrofitting these spaces requires custom ductwork fabrication and design that adapts to your building. Howe’s team routinely works on renovations and retrofits with space and access limitations. We will evaluate your existing conditions, design around the constraints and build components that install smoothly without requiring extensive structural changes.

Indoor pools are an unforgiving environment for standard galvanized steel because they combine high humidity with chlorine. The resulting corrosion leads to leaks and expensive repairs. As an expert sheet metal contractor in South Dakota, we recommend custom aluminum ductwork for pools, aquatic centers and other high-humidity spaces because it withstands moisture and chemical exposure without rusting or degrading. If your project needs ducts that can resist humidity and chlorine, we design and build aluminum systems that meet those requirements.

Commercial and industrial kitchens exhaust hot, grease-laden air that standard ductwork can’t safely handle. Grease ducts must be heavy-gauge, welded liquid-tight and built to meet local and state fire safety and containment code requirements.

We fabricate black iron grease ductwork for kitchen hoods, cook lines and food‑service ventilation systems. Our certified welders build each section to withstand heat, grease and continuous use, giving you a professionally installed system built to meet inspection requirements.

Manufacturing facilities, industrial plants and specialty environments frequently have unique airflow requirements that standard ductwork can’t deliver, including high-volume/low-velocity systems, process exhaust and targeted ventilation.

Our commercial sheet metal fabrication company designs and fabricates ductwork for these applications using the appropriate materials, thicknesses and reinforcements for the pressure class. Whether you’re moving large volumes of air or capturing process exhaust, we build components that match your specifications.

Custom ductwork design is part of the architecture in many commercial and institutional spaces. Curved, radiused and exposed duct runs require precise fabrication to look intentional, not improvised. We build curved and spiral ductwork, decorative elements and exposed runs where appearance and airflow are equal priorities, working closely with your architect or designer to create components that match your aesthetic goals and conform to your technical requirements.

We build custom sheet metal by matching the equipment, materials and people to your project. We’ll start the design and fabrication process by learning all about your challenges, specifications and timeline.

• Precision equipment that produces consistent results: Our automated coil line forms straight ducts with consistent seams and dimensions, keeping large runs uniform and predictable. For fittings, transitions and specialty shapes, we use CNC plasma cutting to produce smooth, accurate pieces that are designed to connect cleanly with minimal field modifications. For you, that means ductwork that aligns, seals correctly and fits the first time.
• Matching materials to your space: We will tailor our commercial sheet metal fabrication to your application. We work with galvanized steel for most commercial systems, stainless steel for added durability and chemical resistance, aluminum for pools and other humid areas and black iron for grease ducts in commercial kitchens. If your project needs a specific finish for durability, surface friction and corrosion resistance, we can add those too.
• Engineering up front: Before making the first cut, our engineers will review your drawings, specifications, airflow requirements, deadline and budget. This preliminary legwork lets us design ductwork for your building’s pressure class, reinforcement needs and installation paths. It also prevents surprises in the field, especially on projects with tight spaces or complicated routing.
• Certified welders for structural and specialty work: Our experienced, trained welders handle components like welded ducts, structural elements and decorative pieces in-house. They ensure tight seams, aligned joints and specialty pieces that match your project’s dimensions.
• Built to SMACNA standards: Every piece we fabricate follows the Sheet Metal and Air Conditioning Contractors’ National Association guidelines for metal thickness, seams, joints, reinforcement and sealing. That ensures your ductwork holds its shape, minimizes leakage and matches your engineering specs.

You don’t need to have a finished design in hand before you call us. Most of our industrial and commercial fabrication services begin with a simple conversation. Tell us what obstacles you need to overcome, from tight spaces and unusual airflow to retrofitting an older property, and we’ll design and build components that work together in perfect harmony.

Our engineers will assess your space, specifications, timeline and budget, then coordinate the design with other tradespeople, including virtual design/construction and building information modeling teams, so your ductwork fits the structure. Once we finalize the design, we’ll fabricate each piece in our Sioux Falls facility. The same team that builds your custom ductwork will also install it.

Local startup HVAC companies must sometimes pass on projects with complex or oversized ductwork that’s outside their in-house fabrication capacity. Throughout our five-state service area, we partner with contractors who need custom components built to their specs, so they can bid on work they’d otherwise have to decline.

Think of Howe’s team as an extension of your shop. While you maintain relationships with your valued customers, we’ll be there behind the scenes to provide our engineering expertise, custom fabrication capabilities and specialty materials when the job calls for something beyond standard parts. Whether it’s tight spaces, unusual angles, kitchen grease ducts, aluminum for pools or high-volume airflow systems, we supply what you need so you can confidently say yes.

You’re not our competitor—you’re a valued part of our team. When a job requires custom sheet metal, we’ve got you covered.

SMACNA standards are the industry’s construction guidelines for sheet metal ductwork. If you’ve ever searched for SMACNA ductwork, you’ve probably seen references to metal thickness, seams, joints, reinforcement and sealing, all of which come from the Sheet Metal and Air Conditioning Contractors’ National Association.

Many commercial and industrial specifications require adherence to these guidelines, which Howe follows when fabricating every piece. Ductwork built to these standards holds its shape, leaks less, lasts longer and matches your engineer’s specifications. When your ductwork follows SMACNA, it installs more cleanly, performs more reliably and aligns with your system’s pressure class.

The Butterfly House is a leading attraction at the Sioux Falls Zoo & Aquarium, one of only a small handful of butterfly houses nationwide that are open year-round. The exhibit requires high-volume, low-velocity airflow gentle enough not to disturb free‑flying butterflies while maintaining precise temperature and humidity levels, even during harsh South Dakota winters. This challenge provides a real-world example of how custom fabrication solves problems that standard parts can’t.

Knowing that traditional duct sizes and airflow patterns create drafts that are powerful enough to disrupt a butterfly habitat, Howe’s engineering and fabrication teams designed and built oversized spiral ductwork to match the exhibit’s stringent airflow requirements. The larger diameter allows high volumes of air to move slowly and evenly, creating a stable environment for butterflies and aquatic species. Our team coordinated the design with the building’s mechanical systems, then fabricated and installed each section from our Sioux Falls facility.

The result is a climate‑controlled space that protects delicate species, supports the exhibit’s mission and provides a more pleasant experience for visitors.

Every commercial building has tight spaces, shifting field conditions and coordination challenges. When one company fabricates ductwork and a different team installs it, the mismatch often introduces complications like delays, handoffs and surprise last‑minute fixes.

Trusting a single partner to handle design, fabrication and installation helps your project progress more smoothly. Our engineers will coordinate with other tradespeople as needed before beginning fabrication. Because the same team that designs your ductwork also builds it in our Sioux Falls shop, nothing will get lost in the shuffle—and if field conditions change, we can quickly adjust without working around another vendor’s schedule. For you, that translates to stricter quality control, seamless installation, fewer missed deadlines and ductwork that performs as well as you expect it to.

Custom ductwork solves problems standard parts can’t, but it benefits from proactive design, materials and routing. That’s why the best time to bring a fabrication partner into your project is during preconstruction, before clashes, tight spaces or specialty requirements materialize in the field.

Howe’s commitment to craftsmanship leads to fewer delays and ductwork that fits the first time. Here are a few signs your project would benefit from custom fabrication.

• Irregular dimensions: Custom ductwork prevents rework in buildings with tight ceiling cavities, unusual angles, oversized airflow needs or architectural features that don’t match standard sizes.
• Renovations and retrofits: Many older structures predate modern HVAC. Let us help you avoid surprises behind walls, above ceilings or in mechanical rooms.
• Unique environmental requirements: Pools, high‑humidity spaces, commercial kitchens and process ventilation all require specific materials and construction methods. Early coordination is the foundation of a compliant, durable system.
• Aggressive schedules: Design-build and prefabrication push the project forward, even when timelines are tight. Early involvement means fewer handoffs and faster adjustments when field conditions shift.

Whether you’re a contractor who needs a fabrication partner for a specialized project or a business owner who knows standard ductwork won’t meet your needs, our engineers and fabrication team are here for you. You don’t have to hammer out all the design details before you call—we’re happy to put our mechanical prefabrication proficiency to work.

We’ve consulted on commercial, industrial and institutional projects across South Dakota, Iowa, Minnesota, North Dakota and Nebraska since 1940, and we’ve solved a wide range of airflow challenges in that time. If your project needs ductwork or sheet metal that standard parts can’t deliver, we’ll review your specifications, understand the requirements and build components that fit the first time. To get started, call or text us at 605-339-2020 or request a consultation online.