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Attenuators

ACRAN attenuators are manufactured to allow passage of air while reducing the noise level along the air path. The attenuators are manufactured to suit each application and are not restricted to meeting module sizes. Our manufacturing process enables maximum flexibility when balancing the space requirement with the acoustic and airflow restraints.

ACRAN has a wide range of attenuators to meet the requirements of all situations. Typically attenuators are manufactured from galvabond however, if required, the attenuators can be manufactured from other materials including stainless steel and aluminium to provide additional corrosion protection in harsh environments.

The attenuators are laboratory tested to Australian Standards in our own Acoustic Testing Facility.

Typical Applications

  • Plant room ventilation
  • Ventilation to acoustic enclosures
  • Air conditioning installations and cooling towers
  • Silencers for exhaust fans
  • Power generation equipment
  • Outdoor air ventilation systems
  • Refrigeration plant

Benefits

  • Guaranteed performance – tested to Australian Standards
  • Wide range of flanging options including TDC/TDF
  • Choice of finishes & build materials
  • Cost effective with long life and low maintenance
  • Sturdy construction designed to suit all applications

Performance Data

  • M3ST
  • M4ST
  • M6ST
  • M8ST

Acraflow Rectangular Attenuators – M3ST

Static Insertion Loss(dB*)

Length (mm) 63 125 250 500 1000 2000 4000 8000 Hz
900 4 7 18 34 43 38 22 14 dB
1200 6 10 23 40 47 42 28 17 dB
1500 6 16 32 42 48 42 32 20 dB
2400 10 28 38 46 52 50 43 28 dB

* Tested in accordance with AS 1277-1983

900mm Long Attenuator 1200mm Long Attenuator 1500mm Long Attenuator 2400mm Long Attenuator

Acraflow Rectangular Attenuators – M4ST

Static Insertion Loss(dB*)

Length (mm) 63 125 250 500 1000 2000 4000 8000 Hz
900 4 6 16 31 40 36 17 11 dB
1200 5 10 21 39 46 41 23 14 dB
1500 5 11 27 42 46 41 26 16 dB
2400 9 19 38 46 48 47 39 26 dB

* Tested in accordance with AS 1277-1983

900mm Long Attenuator 1200mm Long Attenuator 1500mm Long Attenuator 2400mm Long Attenuator

Acraflow Rectangular Attenuators – M6ST

Static Insertion Loss(dB*)

Length (mm) 63 125 250 500 1000 2000 4000 8000 Hz
900 3 6 12 24 30 21 12 9 dB
1200 4 7 18 31 36 27 14 10 dB
1500 5 10 21 38 43 33 19 13 dB
2400 7 14 34 46 47 45 28 19 dB

* Tested in accordance with AS 1277-1983

900mm Long Attenuator 1200mm Long Attenuator 1500mm Long Attenuator 2400mm Long Attenuator

Acraflow Rectangular Attenuators – M8ST

Static Insertion Loss(dB*)

Length (mm) 63 125 250 500 1000 2000 4000 8000 Hz
900 3 4 10 20 24 15 9 6 dB
1200 3 5 15 26 29 19 11 8 dB
1500 4 7 18 33 37 24 12 9 dB
2400 7 11 31 47 49 37 15 11 dB

* Tested in accordance with AS 1277-1983

900mm Long Attenuator 1200mm Long Attenuator 1500mm Long Attenuator 2400mm Long Attenuator

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