The unique design of Helical's Spiral Round Ducts offer the air-handling industry greater economy in comparison to standard rigid ducts without compromising on the product's high standard performance, quality, strength and ease of installation.

Our tubes are suitable for HVAC supply and return air ductwork for almost all conditions of pressure and velocity.

Spiral Exhaust Ducts

A winning combination of a uniquely designed lock-formed seam and consistent, calibrated tolerance, Helical's Spiral Exhaust Duct is a superior quality product available in a wide range of gauges.


  • Diameter - 3 to 80
  • Insulation - Without and with insulation (acoustic)
  • Thickness - 0.4 to 1.2 mm
  • Materials - GI, MS, SS


  • Reduces upfront and operating costs
  • Low air leakage
  • Optimal airflow characteristics
  • Less pressure drop allows smaller and more efficient air-moving equipment
  • Inherently stronger, allows the use of lighter gauge
  • Cost-effective, due to the use of less costly metal
  • Efficiently manufactured from strip steel to any diameter


  • Air supply including ventilation, such as, the supply of fresh air and exhaust in factory workshop and at production site
  • Exhaust fumes
  • Dust removal
  • Bulk material transport