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Twiga Class ‘O’ Rated Flexible Duct

3.4 out of 5

Twiga Class ‘O’ rated flexible duct, designed for HVAC systems is fire rated, strong, lightweight, fully flexible, compressible yet dimensionally stable. The inner core made of aluminium/met foil is permanently bonded to a coated tough wire helix.

Thermal efficiency is achieved by wrapping with a blanket of glass wool insulation in various densities and thicknesses as per the required thermal resistance on the exterior of the inner core. Outer jacket, which acts as a vapor barrier, is tear and puncture resistant and is made of aluminium/met foil with glass yarn reinforcement.


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Product Specification-

  • Standard length: 3.048 m (10 ft.).
  • Diameter range: 100 mm to 500 mm (4 inch to 20 inch).
  • Maximum rated velocity: 20.32 m/s (4000 ft /min).
  • Temperature range: 0° C – 90° C (32° F – 194° F).
  • Maximum rated positive pressure: 253.99 mm w.g. (10 inch w.g.).
  • Maximum rated negative pressure: 25.39 mm w.g. (1 inch w.g.j).
  • Fire rating: certified as per BS 476 Part 6 and 7 (Class ‘O’).
  • For insulated ducts
  • Standard insulation density: 16 Kg/m* (1 lb/ftp).
  • Standard insulation thickness: 25 mm (0.98 inch).
  • Insulation R value: 0.64 m 2K/W (3.63 Fft2hr/Btu).
  • NOTE: alternate insulation densities and thicknesses are available upon request for higher thermal resistance.

Application and Benefits-

  • Ideal for all air-conditioning and ventilating systems in hospitals, hotels, industrial, residential, commercial and office buildings.
  • Available both – with and without insulation.
  • Due to the high degree of flexibility, it allows ducting around obstacles where prefabricated metal ducts would be difficult and costly to install.
  • A quick and economical means of correcting the misalignment between systems.

Products / Materials of Construction


  • Insulated flexible ducts.
  • Uninsulated flexible ducts.

Material of Construction:

  • Inner core: aluminium/Met Foil.
  • Outer jacket: aluminium/Met Foil.

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Twiga Class ‘O’ Rated Flexible Duct
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