Case study - Acoustic Insulation for HVAC Silencers

Case study

Application: HVAC Silencers
Products: Bradford Glasswool, Ultratel 48kg/m3 with
Black Matt Facing
Performance: Sound Attenuation
HVAC Silencers

Acoustic Insulation for HVAC Silencers

Application Overview

HVAC systems are required to provide comfort to building occupants, they are, however often a source of noise within buildings. HVAC system design therefore needs to balance temperature and humidity control with noise reduction. The most common source of noise in HVAC systems are the large central motors and fans otherwise known as air handling units.

HVAC Silencers

Air handling units need sound attenuation to reduce the transmission of noise to the rest of the building. HVAC Silencers are a reliable solution and are often positioned a short distance downstream from the air handling unit. A Silencer is typically an in‑line section of duct with integrated baffles designed to dissipate noise. Small silencers may also be found within the duct system to reduce noise generated by airflow and duct configuration.

Silencers incorporate baffles with internal surfaces fabricated from perforated sheet metal, beneath the perforated metal is high density insulation such as Bradford Glasswool, which provides excellent broadband sound attenuation.

Application Overview Click here to view slideshow Application Overview Application Overview Application Overview Application Overview

Acoustic Performance

The Bradford Glasswool insulation range is often the first choice for HVAC system designers. The extensive range provides solutions for HVAC Silencers, HVAC Duct Lining and HVAC Duct Lagging. In this Case Study the specified product is Bradford Ultratel (48kg/m3) with Bradford’s Black Matt Facing.

Bradford Ultratel (48kg/m³) with Black Matt Facing provides both mass and absorptive properties which is key to ensuring acoustic attenuation across a range of sound frequencies. The Black Matt Facing allows airflow while providing a clean aesthetic finish which also improves the durability of the acoustic baffles.

Product Frequency
125 250 500 1000 2000 4000 5000 NRC
Unfaced (50mm)
0.34 0.65 1.23 1.11 1.08 1.02 0.98 1.02 15278
Ultratel with
Black Matt Facing (50mm)
0.25 0.70 1.13 1.13 1.12 1.12 1.12 1.00 15298

HVAC Silencers

Bradford Ultratel shaped to fit the acoustic baffle frame

Bradford Glasswool Manufacturing

Bradford manufactures to strict product tolerances and provides the most comprehensive warranty in the market with a lifetime cover on performance of product, all 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
HVAC Silencers
Download Case Study

Air handling units need sound attenuation to reduce the transmission of noise to the rest of the building. HVAC Silencers are a reliable solution. Download the PDF for more information.

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.