Insulated Spiral Duct Systems

Roladuct produces an extensive range of internally insulated spiral duct in round and oval forms for conditioned air handling.

Both round and oval insulated duct and fittings are double walled, consisting of an outer pressure tight shell, a layer of fire resistant or acoustic glass fibre or similar insulation and an inner liner of perforated metal.

Both inner and outer liners are manufactured from our 4 ply lockseam ductwork utilising premium grade zinc coated steel or aluminium.

Where only thermal insulation properties (and not acoustical) are a factor, insulated duct is optionally available with unperforated internal liners.

Insulation Thickness

Insulation is available in the following thicknesses:

  • 25mm
  • 50mm
  • 75mm
  • 100mm

Joining Methods

  • Method 1

    joining methods No Capping
    Internal & External Joiner
  • Method 2

    joining methods Flanged Joint
    Internal Joiner
  • Method 3

    joining methods Flanged Joint
    With Capping