Acoustic Attenuators

Wakefield Acoustics designs and manufactures circular attenuators and rectangular splitter attenuators to suit all air and gas movement applications. We work closely with OEM’s, end users, contractors and consultants to address complex noise problems across a wide range of industries including:

Circular Attenuator

From straight-through silencers to high performance units with central absorption pods, Wakefield Acoustics offer a wide range of custom designed circular attenuators to suit all industrial air movement applications.

What is the Purpose of a Circular Attenuator?

A circular attenuator is designed to reduce the noise within a circular or cylindrical duct system, assisting in regulating noise levels to comply with project requirements. Circular attenuators provide a cost effective level of noise reduction, as the items can be mounted directly into ductwork systems.

What is the Purpose of a Rectangular Attenuator?

In industrial ventilation systems, a rectangular attenuator can provide high levels of noise reduction. The acoustic splitters/baffles contained within an attenuator provide a high level of acoustic absorption inside a duct, and the arrangement can be configured to target low or high frequency acoustic issues.

Rectangular and Circular Attenuators

From smaller attenuators for dust extraction plants, through to large attenuators on primary & secondary air fans used in power generation, Wakefield Acoustics offer a wide range of custom designed attenuators to suit all air movement applications.

Inlet air filters are commonly used in conjunction with our range of rectangular splitter attenuators where a filter bank is installed prior to the acoustic baffles. Access to the filters can be gained either through a side access door fitted into the filter plenum or via the end of the attenuator should space permit. Additional features can also be incorporated into the fabrication of an industrial attenuator, including motorised dampers and weather louvres.

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  • Melinex moisture resistant membrane for damp process air
  • Aerodynamic ‘V’ noses and ‘Bull’ noses to reduce pressure loss
  • Operating temperatures in excess of 250°C
  • Combined inlet filter silencers complete with filter slides and cells.
  • Transition pieces
  • Weather cowls and louvres

Various finishes include:

  • Polyester powder coated
  • Wet paint systems
  • Plastic coated steel
  • What is the difference between an attenuator and a silencer?

    A ventilation air ‘attenuator’ is generally considered to be acoustically absorptive, and is used for ventilation applications. Absorptive attenuators are used in HVAC systems within buildings, and within industrial air movement applications.

    People can refer to attenuators as ‘silencers’, though a ‘silencer’ is normally used as part of an engine exhaust system in power generation applications. Circular ‘silencers’ are also employed in industrial settings, such as steam vents and ‘blow-off’ lines.

    In conclusion, attenuators are generally associated with ventilation and air movement using a fan, and silencers deal with gas movement from machines / systems. However, the two terms are sometimes used interchangeably.

  • What materials are used in sound attenuators?

    Our attenuators are constructed from pre-galvanised mild steel casings which can either be riveted, bolted or welded depending on application. Larger attenuators that require additional structural integrity are manufactured from heavier plate carbon steel with external stiffeners.

    All our attenuators have aerodynamic inlet fairings to reduce pressure loss, mineral wool infill protected by either a glass tissue scrim spun bound poly cotton or a woven glass cloth lining and a final layer of perforated sheet steel protection.

    The acoustic media utilised in Wakefield Acoustics attenuators is inert, non-combustible, non-hygroscopic, vermin proof and can be wrapped in a ‘Melinex’ water resistant membrane to keep out moisture and other contaminants in the airflow.

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