Rectangular Silencers

Performance Attenuation for Rectangular Connections

Typically used in rectangular duct systems, with AHU systems, and on plant that requires a high level of attenuation. Our rectangular silencers feature variable splitter configurations allowing for a balance between system resistance and acoustic performance.

Our Standard Rectangular Silencers

Rectangular Silencer – R02

High-performance rectangular attenuator designed for use with AHU systems and on plant systems requiring high levels of attenuation.

Available in seven standard lengths R02 Rectangular Duct Mounted Silencers have excellent attenuation properties, achieved with sound absorbing infill splitters, retained in the attenuator casing by a perforated liner.


Rectangular duct mounted splitter silencers can come in variable dimensions and are “mass customised” to suit the specific balance of airflow volume, resistance, self generated noise and insertion loss required. We can design in 1mm increments without a maximum size, as large units are assembled in modules. Our automated engineering systems allow us to easily select plenum at entry or exit, circular or rectangular offset spigots, various flange connections and special interfaces.

  • High performance rectangular duct silencers
  • Seven standard lengths in seven airway patterns
  • Standard lengths are: 600mm, 900mm, 1200mm, 1500mm, 1800mm, 2100mm & 2400mm
  • Many connection options
  • Cross section dimensions in 1mm increments
  • System pressure within ducted systems to 1500 Pa
  • All lengths are available

The resistance to airflow is a function of the face velocity and length. It is not recommended to select the R02 Silencers with a face velocity above certain limits, depending on the model, without asking advice regarding re-generated self noise. We can advise on the selections and can perform system analysis to ensure the correct unit is specified.

We can also provide Residential Silencers.

Material & Finish

All components are manufactured from mill finish hot dip galvanised mild steel conforming to EN10327 (BS2989). To prevent erosion of absorbing materials, our rectangular silencers are fitted with perforated splitters manufactured from galvanised mild steel conforming to EN10327 (BS2989). Rectangular silencers utilise acoustic grade mineral fibre absorbing infill and are manufactured to the HVCA specification DW144 class B and M&E 100 for sheet steel thickness and stiffening.

  • Pressure up to 1500 Pascals positive and negative.
  • Temperature -12° to +100°C.
  • Location internally & externally mountable.


We can also supply custom materials such as 304 and 316 grade stainless steels, cold reduced (CR4) mild steel and aluminium.

Connection Extras

Circular spigot end caps, MEX Flanges, Ductmate Flanges and more are available!

Painted Finish

We have a range of finishes including painting to your bespoke needs.

Optional Melinex Lining

For critically clean applications, Melinex lining can be included to prevent fibre migration.

Bespoke Rectangular Silencers

Looking for something more bespoke?

As well as our standard silencers, we can also offer bespoke attenuator construction for use in industrial and marine applications.

This can include, but not limited to, the following specifications:

  • Full fabrication and welded seams
  • Stainless steel specification
  • Heavy-duty gauges up to 10mm
  • Lightweight aluminium/aluzinc specification

For more information, please get in touch via the contact form below.

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