Glasswool Duct Board for HVAC Application


Glasswool duct board is a rigid board of insulation material manufactured from resin bonded inorganic glass fibers. The exterior surface of the board is a factory-applied reinforced aluminium foil, air barrier and water vapour retarder. The edges of the board are formed by machine to create a ship lapped edge or grooves. It allows the grooves to be joined for building straight ducts of any size or length. Duct system components such as tees, offsets, elbows, and transitions may be fabricated from flat duct board. Duct boards are fabricated into ducts to make HVAC duct system.

Features & Benefits

  • Fire safe - made from rigid glasswool boards which provide thermal and acoustic insulation.
  • Faster installation - easy to install and light weight.
  • Lower installed cost - minimal material waste, higher productivity.
  • Flexibility of site fabrication and assembly – adaptable to job site changes.
  • Precision of factory-made ducts – low leakage rates.
  • Improved performance and energy savings.
  • Excellent aesthetics – a cleaner look.
  • Outer facing provides resistance, stiffness and a vapour barrier and inner facing provides a smooth and cleanable surface.


  • Pre-insulated duct board shall be made of a high density of rigid resin bonded fire safe glasswool with both sides factory laminated aluminium foil, an outer facing foil is having - reinforced Aluminium + Kraft+ Glass Veil and inner facing - Black Glass textile.
  • Density of glasswool duct board shall be 75-80Kg/m3 and at the edge of panels shall have a density of 150Kg/m3 .Size of panels for duct construction as below.


Thickness(mm) Length(m) Width(m)
25 2.5 1.19

The thermal conductivity of duct board shall not be exceeding 0.033 W/m K at 25° C means temperature and thermal resistance should be more than 0.6 m2.K/W.

Glasswool duct panels shall be tested as per EN 13403 Vapour permeance of duct panels should be approximate value: 0.013 g/m2. day mm Hg (outer-facing).

Mechanical stiffness: R5 rigidity, according to EN 13403 (European Standard for non-metallic ducts) this rigidity is the maximum level of the ones established by this standard.

Duct board should withstand pressure under 800 Pa with no evidence of fissures or swelling (test according to EN 13403.)

Fire test: Panels shall be tested as Euroclass: Euro class B-s1, d0.

  • s1: null smoke emission.
  • d0: non flaming droplets / particles.

Joint system: Duct boards should have an exclusive design with male / female edges, in order to provide greater strength for joints, easy installation and shall reduce the number of cutting operation and exceptional inside finish.

Tools and accessories for Installation of Duct Boards shall be followed as per the recommendation of the manufacturer’s manual.

Duct support: Duct board shall be installed, using support as described in the installation manual of manufacturers. The maximum distance between hangers/support shall not exceed for horizontal ducts as

  • 900 mm inner dimension maximum distance of hanger 2.4 m.
  • 900-1500 mm inner dimension maximum distance of hanger 1.8 mm.
  • Above 1500 mm inner dimension maximum distance of hanger 1.2 m.

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