Round Metal Duct Pipe — Galvanized, Aluminum & Stainless Steel
Shop round HVAC duct pipe fabricated to order in standard and custom diameters. Built for residential retrofits, commercial trunk lines, and industrial ventilation systems — configure in 3D or request a custom quote.
Round Duct Pipe Built to Perform, Not Just to Fit
Round duct is the most aerodynamically efficient shape for moving air through an HVAC system. With lower friction loss per unit of airflow compared to rectangular duct, it's the preferred choice for long trunk runs, high-velocity supply systems, and anywhere you need to minimize static pressure drop. Every piece of round duct from Duct2Go is fabricated in-house from 26-gauge to 20-gauge sheet metal depending on the diameter and application.
Standard material is galvanized steel — the code-compliant choice for most residential and commercial HVAC installations. Aluminum is available for coastal, corrosive, or weight-sensitive environments. Stainless steel is available for food service, healthcare, cleanroom, and high-moisture applications including data center cooling infrastructure. All round duct is manufactured to SMACNA standards ensuring consistent sizing and leak-free seams throughout your system run.
Common Round Duct Sizes and Their Applications
Round duct is available in diameters from 4 inches to 24 inches (and beyond on custom orders). Here is a practical guide to the most common sizing for residential and commercial use:
• 4" – 6": Branch runs to individual rooms, bathroom exhaust, kitchen range hood, dryer vents
• 7" – 8": Supply branches for medium-output registers, return air branches in residential
• 10" – 12": Sub-trunk lines in residential systems, primary supply in small commercial
• 14" – 18": Commercial main trunk lines, air handler connections, ventilation mains
•20" – 24"+: Industrial ventilation, large commercial AHU connections, makeup air, data center cooling
Not sure what diameter your system requires? Our team can help you calculate CFM requirements and recommend the right size based on your load calculations or existing system specs. Use the custom quote form or contact us directly at Info@duct2go.com.
Factory Direct. No Minimum. Ships in 7 Days.
Ordering round duct from Duct2Go means buying directly from the fabricator — no distributor markup, no back-order guessing, and no minimum order requirement. Standard sizes can be configured online through our 3D duct configurator. Non-standard diameters, custom lengths, and specialty gauges are available through our custom quote process. Quotes are returned within one business day, often the same day.
Every order ships flat-packed or palletized via LTL freight carrier from our Chandler, Arizona production facility with tracking provided from our shop to your door. We serve HVAC contractors, mechanical engineers, facility managers, and project owners across all 50 states.
Frequently Asked Questions
What materials are available for round duct pipe?
Duct2Go fabricates round duct in three materials: galvanized steel (standard for most HVAC applications), aluminum (lightweight and corrosion-resistant for coastal, outdoor, or wet environments), and stainless steel (for food service, healthcare, cleanroom, or high-moisture installations including data center cooling systems). All three are available in standard and custom diameters.
What diameters of round duct do you carry?
We fabricate round duct from 4 inches through 24 inches in standard increments. Custom diameters outside this range are available through our custom quote process. Contact us at Info@duct2go.com or call 480-452-8069 with your specs and we'll confirm feasibility and pricing within one business day.
Is your round duct SMACNA compliant?
Yes. All round duct shipped by Duct2Go is fabricated to SMACNA (Sheet Metal and Air Conditioning Contractors' National Association) standards, including seam construction, gauge requirements, and dimensional tolerances. This ensures compatibility with standard fittings and code compliance on commercial and industrial projects.
Can I configure round duct online using the 3D tool?
Yes. Standard round duct sizes can be configured directly in our online 3D duct configurator — select your diameter, length, material, and quantity, and the system builds your order spec in real time. For non-standard sizes or custom gauges, use the custom quote form and our fabrication team will respond within one business day.
How long does it take to receive my round duct order?
Standard round duct orders ship in an average of 9 business days from our Chandler, AZ facility. Depending on where you are located in the country most shipments arrive within 5-7 business days with priority shipping options available to reduce the delivery time.
