Case study - Acoustic and Thermal Insulation for HVAC Ducts

Case study

Application: HVAC Ducts
Product: Bradford Glasswool, Supertel 32kg/m3 with Acoustituff Facing or Heavy Duty Perforated Facing
Performance: Sound Attenuation and Thermal Resistance
HVAC Ducts

Acoustic and Thermal Insulation for HVAC Ducts

Application Overview

Commercial HVAC (Heating, Ventilation and Air Conditioning) systems are typically driven by large central motors that push conditioned air to each room of a building through a complex network of metal ducts. It’s within these ducts that CSR Bradford provide a high performance insulation solution that ensures the HVAC system achieves the NCC energy efficiency targets and delivers thermal and acoustic comfort to building occupants.


Bradford Supertel 32kg/m3 is a high performance insulation that’s installed inside HVAC ducts for sound attenuation and thermal resistance. The product can be acoustically tuned with a range of factory applied facing materials such as Acoustituff and Heavy Duty Perforated Foil.

The product reduces noise from the HVAC motors travelling though the ducts into the rooms while it’s thermal performance helps maintain a consistent air temperature throughout the long network of ducts.

Commercial HVAC ducts are manufactured and insulated offsite by specialised sheet metal fabricators. During the duct manufacturing process, metal pins are welded to each internal face so that the insulation can be impaled and positioned as a continuous internal lining. Metal clips secure the insulation in place and metal angles or foil HVAC tape are installed to complete corners and edges.

HVAC Ducts

Metal pins welded to internal face of duct

HVAC Ducts

Insulation impaled through welded pins

HVAC Ducts

Metal angles installed to complete corners and edges

Thermal Performance

The Bradford Glasswool insulation range is often the first choice for HVAC system designers. The extensive range provides solutions for HVAC Duct Lining, HVAC Duct Lagging and HVAC Silencers. In this Case Study the featured product is Bradford Supertel (32kg/m3) and is available in the following thicknesses and R-Values:

Supertel Thickness 13mm 25mm 40mm 50mm 75mm 100mm
Material R-Value R0.4 R0.8 R1.2 R1.5 R2.2 R3.0

Acoustic Performance

Acoustituff Facing with; Bradford Supertel 32kg/m3 75mm

Acoustituff facing provides a sealed face to the insulation material, separating it from contaminates found in some ducted air streams. Its light weight construction allows low to mid frequency to pass through it into the insulation.

HVAC Ducts

Bradford Supertel 32kg/m³ 75mm Glasswool with Acoustituff foil facing NRC: 0.95 Flow Resistivity (no facing): 13,580 (Rayl/m)

Heavy Duty Perforated Facing with; Bradford Supertel 32kg/m3 75mm

The Heavy Duty Perforated facing protects the insulation material whilst maintaining the sound absorptive properties of the insulation. Its perforated construction allows a broad range of frequencies to pass through it into the insulation.

HVAC Ducts

Bradford Supertel 32kg/m³ 75mm Glasswool with Heavy Duty Perforated foil facing NRC: 1.10 Flow Resistivity (no facing): 13,580 (Rayl/m)


Bradford Glasswool Manufacturing

Bradford manufactures to strict product tolerances and provides the most comprehensive warranty in the market and is backed by CSR, Australia’s oldest and most trusted building products manufacturer.

Technical Project Support

The DesignSmart team has a wealth of construction experience and utilise industry-leading building science research for acoustic, thermal and fire insulation products. As the experts in building insulation they can assist with:

  • project-specific support
  • value engineering challenges
  • specification documentation
  • system design detailing
  • product installation and certification

Call the DesignSmart team on  1800 354 044 or visit our Technical Project Support page.

Contact DesignSmart

For architects, engineers and builders:

  • Expert insulation advice
  • Project and value engineering support
  • Industry-leading building science research
1800 354 044
bradforddesignsmart@csr.com.au
HVAC Ducts
Download Case Study

Commercial HVAC systems are typically driven by large central motors that push conditioned air to each room of a building through a complex network of metal ducts. It’s within these ducts that CSR Bradford provide a high performance insulation solution.

Technical Project Support

Bradford has experts located around Australia available to help architects & specifiers with their technical specifications.

Learn more with Bradford's CPD Programs

Bradford offers knowledge training with the additional benefit of accredited CPD points in your office as well as regularly scheduled external events.