Galvanized Lock Seam Spiral Duct
Fastflex's galvanised lock seam spiral duct is a high-strength, corrosion-resistant round duct solution suitable for a wide range of HVAC, ventilation, and air diffusion applications in residential, commercial, and industrial settings.
Manufactured using a 4-ply spiral lock seam construction, this duct provides superior rigidity and structural strength compared to traditional longitudinal seam ductwork — requiring fewer hangers and joints across long runs. The smooth interior surface minimises air resistance and turbulence, delivering efficient airflow with low pressure drop, making it well suited to medium and high velocity ducted systems.
The galvanised steel construction provides lasting corrosion resistance, ensuring reliable long-term performance in a variety of installation environments including ceiling spaces, exposed commercial applications, mechanical plant rooms, and industrial ventilation systems. The continuous interlocked reinforcing rib formed on the outside of the duct adds further rigidity without adding weight.
Available in multiple diameters to suit a wide range of project requirements, this spiral duct pairs with standard HVAC fittings including elbows, reducers, tees and flanges for complete system installation.
Key features:
4-ply spiral lock seam construction for maximum strength and rigidity
Smooth interior for low friction loss and efficient airflow
Galvanised steel for long-lasting corrosion resistance
Available in multiple diameters
Suitable for residential, commercial and industrial HVAC applications
Compatible with standard spiral duct fittings and flanges
Fewer joints and hangers required compared to rectangular ductwork
Suitable for medium to high velocity air systems
Compliant with Australian standard AS4254
