Double-Wall Ductwork from Hennemuth
Double-wall ductwork gives HVAC contractors a durable, insulated option for commercial projects that require thermal control, noise reduction, or a clean finished appearance. Hennemuth Metal Fabricators fabricates double-wall spiral and rectangular ductwork for contractors, installers, project managers, and estimators working on commercial HVAC jobs throughout Pittsburgh and within a 200-mile service radius.
Our team produces ductwork, fittings, custom lengths, and connection options designed to fit together cleanly in the field. With in-house fabrication, quick lead times, and a knowledgeable staff that is easy to reach, Hennemuth helps contractors get the ductwork they need to keep projects moving.
Double-Wall Specifications
Hennemuth fabricates double-wall spiral ductwork in a range of materials, sizes, insulation thicknesses, and connection options. Standard and custom lengths are available to help HVAC contractors save time in the field and reduce the need for on-site adjustments.
- Diameters: Galvanized and galvanneal options are available in diameters from 4 to 40 inches. Double-beaded options are available from 10 to 38 inches.
- Lengths: Standard 10-foot lengths are available, with custom-cut lengths from 12 inches up to 20 feet.
- Coating: Powder coating is available in a variety of colors.
- Insulation: Internal insulation is available in 1-inch, 1.5-inch, and 2-inch thicknesses.
- Fittings: Hennemuth fabricates gasketed and flanged spiral duct fittings in-house. Fittings from 4 to 20 inches come standard with a gasket connection. For 22 to 40 inches, flanged fittings are available with an optional outer ring for quicker field assembly.
No matter the configuration, our spiral duct is fabricated to meet or exceed the 2005 Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) standards. We use G90 galvanized or galvannealed steel in 22-28 gauge options. The galvannealed steel is excellent if you want a matte finish or want to paint your spiral.
Hennemuth also carries the accessories contractors need for field assembly, including stamped and gored 90- and 45-degree elbows, reducers, couplers, saddle taps, and Gripple hanging products.
Our Double-Wall Spiral Duct
Double-wall round duct elbow showing insulated construction and formed metal segments.
Double-wall round duct tee fitting with a smooth interior liner and fabricated branch connection.
Insulated double-wall round duct elbows and fittings fabricated for commercial HVAC use.
Double-wall round duct sections staged in the fabrication shop before delivery or installation.
Our Double-Wall Rectangular Duct
Hennemuth Metal Fabricators produces double-wall rectangular ductwork and fittings for commercial HVAC contractors. These products include a solid metal outer pressure shell, an inner metal liner, and an insulating layer between the two walls. Depending on the project, double-wall duct can support acoustic control, thermal control, or both.
Our rectangular double-wall ductwork is fabricated with modern equipment and is available in a range of sizes and metal types. Options may include solid or perforated liners, turning vanes, reinforced corners, and custom fittings built to match project requirements.
For contractors, double-wall ductwork can help support consistent airflow, reduce noise, limit heat gain or loss, and provide a clean finished product for commercial spaces such as offices, retail buildings, schools, healthcare facilities, and other occupied environments.
Custom double-wall rectangular duct fitting fabricated with reinforced corners and clean metal seams.
Double-wall rectangular duct section showing the interior liner and fabricated metal frame.
Close-up detail of double-wall rectangular ductwork with insulated construction.
Request Double-Wall Ductwork from Hennemuth
Hennemuth Metal Fabricators supplies double-wall spiral and rectangular ductwork for HVAC contractors throughout Pittsburgh and within a 200-mile radius. Send our team your drawings, photos, sketches, or blueprint takeoff, and we’ll help identify the ductwork, fittings, materials, and connection options needed for the job.
