Specialising in Axial, Rectangular and Tube Sound Attenuators


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HVAC Sound Attenuators
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Specialists in Axial, Rectangular and Tube HVAC Sound Attenuators
for Sound Reduction Manufactured in South Africa

Attenu–Tec Acoustics rectangular and cylindrical duct attenuators provide effective, predictable HVAC noise / sound reduction at substantial savings over other noise reduction methods because Attenu–Tecs’ HVAC attenuator products are laboratory-developed and tested under controlled conditions. 

Moreover, we manufacture HVAC duct silencers to specific metal tolerances and with controlled acoustic infill flow resistances to achieve consistent results. Should none of our standard range of HVAC Attenuator silencers meet your requirements, we will develop one for you.

If you have a special requirement, please contact us and our specialist team will be able to provide you with a bespoke HVAC attenuator solution.

Proudly designed and manufactured in South Africa.

Axial Attenuators

Rectangular Attenuators

Tube Attenuators

Bespoke Design

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Let us help you to deliver on that project with the best manufacturing, quality and service the sound reduction industry has to offer in South Africa.

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About The HVAC Duct Silencer Industry

The HVAC Duct Silencer / Sound Reduction industry is global today, however its humble beginnings are found in 1902, when Willis Carriers addressed the issue of humidity in an enclosed building. This lead to his invention of the first cooling system in 1903, and has since seen great strides in this industry.

Sound attenuators, became popular in the late 1950s to early 1960s, with the first prototypes being designed by companies such as Koppers, Industrial Acoustics Company, Industrial Sound Control, and Eloff Hansson.

Attenuators are used to minimise the noise caused by the movement of air within a building, either from the outside in, or inside out.  There are three main types available, and some may be custom-made depending on the nature of their use and/or adjoining parts. Such systems are widely found in all industries, whether industrial, mining, or commercial industries.

Most attenuators are in-line silencers and are manufactured from pre-galvanised steel with acoustic insulation, wire mesh or perforated sheeting, and fabric lining.

As defined by Wikipedia:

sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

In its simplest form, a sound attenuator consists of a baffle within the ductwork. These baffles often contain sound-absorbing materials. The physical dimensions and baffle configuration of sound attenuators are selected to attenuate a specific range of frequencies. Unlike conventional internally-lined ductwork, which is only effective at attenuating mid- and high-frequency noise, sound attenuators can achieve broader band attenuation in relatively short lengths. Certain types of sound attenuators are essentially a Helmholtz resonator used as a passive noise-control device.

Reference: https://en.wikipedia.org/wiki/Sound_atte­nuator

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Invested in achieving sustainability and success for all, through continuous improvement, reliability, honesty and teamwork

Our Vision Statement

Providing solutions to create a better urban environment for all to live in.