Tunnel attenuators are devices used to reduce the noise produced by ventilation systems in large scale vehicle and rain tunnels. Transport tunnels are frequently located in urban areas with noise-sensitive requirements, as such tunnel attenuators are generally placed within the ventilation ducts or shafts to reduce the level of noise that is transmitted to the surrounding environment.

The tunnel attenuator designs provide suitable attenuation for both inlet and discharge portions of the tunnel ventilation project. Acran Sound Control’s comprehensive knowledge in design and manufacture has led to the development of large splitter assemblies for installation into tunnel shafts and plenums. By reducing the level of noise produced by these systems, tunnel attenuators can help to improve the safety and comfort of workers, users, and people in surrounding environments.

Main applications


  • Vehicle tunnels
  • Rail tunnels

Contact our engineers Contact our engineers

Design features

  • ISO7235 silencer test facility
  • Full range of performance data available to suit varying project requirements
  • Fully engineered design
  • FEA, CFD, Seismic, Fatigue Life, and Fire Analysis
  • Various splitter thicknesses for specific insertion loss and pressure drop performance
  • Certified lifting points provided for all lifted elements
  • Detailed installation instructions provided
  • Modular designs to suit all installations: modules are sized to enable efficient transport and installation, plus easy site manoeuvrability and handling
  • Reduced labour costs to install modules into structural plenums
  • Fully scalable design enabling suitability to all sizes of air paths
  • Fabricated in stainless or coated steels to suit design life criteria

Completed projects

  • Airport Link, Brisbane
  • NSBT 'Clem7', Brisbane
  • Perth Metro Rail Tunnel, Perth
  • ECRL 'Parramatta Rail Link', Sydney

Engineering process

We design and manufacture bespoke noise control and ventilation solutions for your specific commercial or industrial premises.

Acran Sound Control provides highly specialised expertise and experience, engineering prowess with in-house Australian manufacturing, highly trained installation teams, and bespoke project management.

Our bespoke engineering process:

If your business or project needs to control noise or implement ventilation, we will engineer, manufacture and install a bespoke solution designed just for you.


Contact our engineers Contact our engineers