Our ductwork flange is made from roll-formed galvanised steel, in 5m lengths in 20mm, 30mm and 40mm sizes. Complemented by corners of galvanised steel in corresponding sizes which, when used with the right sealant, it effectively prevents air leakage. Ductwork can be clamped using either our universal or heavy-duty duct clamps. Where you need an acoustic or thermal specification for the duct, there is barofoam in 6mm 12mm and 24mm thickness. For airflow control there are twin walled turning vanes, in roll-formed galvanised steel, designed to combine with precision formed mounting track, assembled using the Protrack fixing tool for speed and efficiency.