Spiral Round Duct is the most efficient way to move air in HVAC systems as it allows for greater flow efficiencies.

At CSI Duct, we strive to provide you with well designed and manufactured spiral lock seam duct which is stronger than traditional snap lock seam duct of the same gauge.  Our spiral lock seams have practically no leakage and are the only mechanical seams exempted from sealing under energy standards such as ASHRAE Standard 90.1-2013.

We can design and deliver to your specifications.