Acoustic Louvres

Acran Sound Control › Noise Control Products › Acoustic Louvres

Acoustic louvres, also known as sound attenuating louvres, are ventilation components designed to reduce the transmission of sound through airflows. They are made of multiple rows of parallel blades that are angled to allow air to pass through while also reflecting and diffusing sound waves.

Acoustic louvres are commonly used in HVAC systems, where they help to prevent the transmission of noise from external sources, such as traffic, into a building while still allowing for proper air circulation. They can also be used in commercial and industrial settings to reduce the amount of noise that escapes from ventilation systems.

Louvres are bespoke engineered by Acran Sound Control to provide high acoustic performance and low air flow restriction. The acoustic louvres also provide a satisfying external aesthetic finish whilst maintaining a sturdy appearance when installed into steelwork and pre-formed openings.

Main applications


  • Plant room ventilation
  • Industrial and processing plant ventilation apertures
  • Relief air from factories and workshops
  • Ventilation to acoustic equipment enclosures
  • Air conditioning installations and cooling towers
  • Power generation equipment
  • Outdoor air ventilation systems
  • Refrigeration plant
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Acoustic louvres performance data

Acraflow Acoustic Louvres Series 125/125S

This model has superseded the Series 100

Noise Reduction: January 2023 Test Data:



 Octave band centre frequencies (Hz)
Model 125 250 500 1000 2000 4000
Series 125S 13 13 15 20 23 23 dB
Series 125 14 14 16 21 27 27 dB



  • Test Specimen nominal size 900W x 2400H
  • Air Pressure Drop (APD) graphs are for standard blade spacing
  • For applications where APD is critical please consult Acran Sound Control
  • All tests conducted in accordance with AS 1191-2002
  • Noise reduction = transmission loss + 6dB (across all frequencies)

Acraflow Acoustic Louvres Series 200/200S

Noise Reduction: October 2023 Test Data:



 Octave band centre frequencies (Hz)
Model 125 250 500 1000 2000 4000
Series 200S 14 12 16 23 23 18 dB
Series 200 14 13 17 27 30 22 dB



  • Test Specimen nominal size 900W x 2400H
  • Air Pressure Drop (APD) graphs are for standard blade spacing
  • For applications where the face velocity is above 2.0m/s or Pressure Drop is critical please consult Acran Sound Control
  • All tests conducted in accordance with AS 1191-2002
  • Noise reduction = transmission loss + 6dB (across all frequencies)

Acraflow Acoustic Louvres Series 400 and 580

The Series 580 models have superseded the Series 600

Noise Reduction: July 2020 and July 2022 Test Data:



 Octave band centre frequencies (Hz)
Model 125 250 500 1000 2000 4000
Series 400 15 20 25 27 30 30 dB
Series 580/16 15 20 32 37 32 32 dB
Series 580/20 16 22 27 34 36 33 dB



  • Test Specimen nominal size 900W x 2400H
  • Air Pressure Drop (APD) graphs are for standard blade spacing
  • For applications where APD is critical please consult Acran Sound Control
  • All tests conducted in accordance with AS 1191-2002
  • Noise reduction = transmission loss + 6dB (across all frequencies)

Product sheets

Series 125 product sheet

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Series 200 product sheet

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Series 400 product sheet

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Series 580 product sheet

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We have data available for over ten standard models. For more information please contact our office by phone or email.

Instructions

Acoustic louvres use and care instructions

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Weather louvres use and care instructions

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Design features

  • Tested performance
  • Excellent noise reduction for use of space
  • Choices of materials and finishes provided
  • Manufactured to a maximum width of 3600mm
  • Supplied in module form allowing large openings to be infilled
  • Vermin mesh screens and face fixing angles available as optional extras

Completed projects

  • ABC Studios, Southbank Brisbane
  • Cairns Base Hospital: Air-conditioning plant room
  • Ferny Grove Tavern: refrigeration plant
  • QGC: gas engine enclosure

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.


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