Spiral Lockseam Ducting

Roladuct Round Spiral Duct is manufactured by specialised spiral pipe mills in diameters from 76mm to 2500mm, and in wall thicknesses from 0.6mm to 2.0mm.

Round duct systems enjoy the strongest natural shape for withstanding both internal and external pressure. Add to this a helical 4 ply lockseam (ie 4 x wall thickness) and you have a very rigid structure. The strength is equal to that of conventional formed duct two gauges heavier.

The machine-made uniformity of the Roladuct tube ensures an intact circular and smooth interior for low turbulent flow.


  • Galvabond
  • Aluminium
  • Stainless steel
  • PVC coated gal


  • High strength = fewer hangers
  • Long lengths = fewer joints
  • Ease of installation = less cost for installation
  • Great architectural feature for exposed systems.