Spiral ductwork is a round HVAC duct manufactured with a continuous helical seam rather than a single longitudinal lock seam. This makes it structurally stiffer, more airtight, and better performing in long runs or high-pressure systems. It is used in commercial and industrial HVAC, data center cooling, healthcare ventilation, restaurant kitchens, and exposed-ceiling architectural installations.

Standard snap-lock round duct is formed from a flat sheet bent into a cylinder and locked at a single seam. Spiral duct is continuously wound from a metal strip in a helical pattern. Spiral duct is stiffer, more airtight, rated for higher operating pressures, and has a cleaner exterior appearance — making it the correct choice for commercial systems, exposed installations, and any application with leakage rate requirements.

We fabricate spiral duct from 4 inches through 24 inches in standard increments. Custom diameters are available on request. Common commercial sizes are 8", 10", 12", 14", and 16". For industrial or specialty applications requiring diameters above 24", contact us for a custom fabrication quote.

Yes. Spiral duct is widely used in data center and mission-critical facility cooling because of its dimensional accuracy, low leakage under positive pressure, and compatibility with high-velocity airflow. We fabricate in galvanized steel and stainless steel for data center applications and can work from your mechanical drawings or cooling system layout.

Raw galvanized steel has a distinctive silver-grey industrial appearance that architects and interior designers frequently use as-is. However, spiral duct can be painted with HVAC-approved duct coating if a specific color is required for your project. Contact us to discuss custom finishing options through our fabrication service.