Supplied in Standard 6 Meter Length, Compressed to 0.6 Mts.Individually BoxedEasy to Connect to Either Round or Oval Ducting.No Special Tools Required For Cutting or Fixing.In The Event of Fire No Toxic Gases are Emitted.The Products Have Been Successfully Tested and Fire Resistance RatedSeamless Smooth Interior Surface Ensures a Low PressureThe Lamination of the Layers of Aluminium Polyester and PVC Into One Single Product Gives Extra Strength Durability and Stability.