Guide to Choose the Best 1 Sound Attenuator For HVAC Systems

What Is An Attenuator:

The term “duct silencer” refers to a component of an HVAC system that reduces noise transmission through the ductwork. We also utilize other ductwork components to reduce ductwork sound levels.

A sound attenuator is another name for it. We install it around noise-generating elements in HVAC ducting, such as air handling units and fans, fire dampers, and airflow regulators. Moreover, we can also install Duct silencers, which are suitable with other HVAC system components, and in the visible parts of your exposed ducting.

A variety of HVAC sound attenuators are available from a variety of firms. When making a decision, it’s important to understand the many sorts of products available in the market. We’ll go over some of the many types of HVAC duct silencers, as well as other related information, to assist you to make an informed purchase decision.

Types Of Sound Attenuators

When it’s critical to control the noise generated by your HVAC system, sound splitters come in handy. While allowing air to circulate into your HVAC inlet or outlet, the device acts as a noise reducer. It’s primarily based on the noise source’s primary frequency. It is available in a variety of sizes and shapes, as well as customizing possibilities, to meet the needs of the customer.

You can pick between the following alternatives depending on the type of ducts you have. You can also have the product customized to your specifications and site conditions.

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Attenuators With A Rectangular Shape

People normally use these types of HVAC silencers primarily to reduce the aerodynamic noise generated by the system. We install this product with vertical attenuating splitters in rectangular HVAC ducting. The baffles are made out of a metal frame and a sound-absorbing infill. The infill is made up of a mix of rock wool-based panels that do not easily catch fire. The exterior surface of the component is covered with abrasion-resistant fabric to protect the wool material.

Attenuators In A Circular Shape

Commonly, we utilize this type of HVAC silencer as a noise-mitigating option in round HVAC ductwork. It provides the best possible acoustical performance while also reducing HVAC system pressure decrease, especially at high speeds. It is possible to obtain the desired aerodynamic performance without the use of square-round HVAC reducers.

What Else Should You Think?

It’s crucial to consider the allowed flow velocity in relation to the specific silencer sounds and the air pressure while choosing the right attenuator. Another element to consider when dealing with HVAC air distribution product vendors is the type of location and the ventilation system needs. For example, in an industrial setting, a ventilation system might need to be resistant to toxic substances like acids.

Silencers manufactured from aluminium or another material might be chosen depending on the nature of your area.

What Are Sound Attenuators / Fan Silencers And How Do They Work?

Attenuators use a sound-absorbing insulator called Rockwool to keep the noise down. This insulation results from the formation of millions of small air pockets that absorb sound waves and energy as they pass through the attenuator, lowering noise levels.

Attenuators do not have to be used only at the exhaust point of a fan or HVAC system. Additionally,  we can also employ attenuators at the intake point, as they will absorb airborne noise regardless. They are more than simply an afterthought in the HVAC system. Moreover,  we should consider attenuators as one of the system’s essential components.

They will have a better impact if we install attenuators as an integral part of the system. We need to install them in the very beginning. 

The thickness of the insulation in the attenuator varies based on the size of the component required. Moreover,  it also depends on the wavelength of the sound produced by the HVAC system which must be reduced.

The length of the attenuator, in addition to the thickness of the insulation, impacts the level of sound attenuation achieved; the longer the attenuator, the greater the level of absorption produced.

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What Happens To Absorbed Noise?

The noise collected by the insulation is stored and converted into heat energy, which is then released over time.

Attenuators also have heat safety options to a certain extent. In the second half of this article, we’ll go over our criteria for heat safety and sizing.

Where Do Sound Attenuators Get Installed Or Used?

Sound attenuators are an important part of every ventilation system. Their primary purpose and designs are to reduce noise in ventilation ducting.

In many circumstances, technicians install a ventilation diffuser between both the fan and the diffusing fan before the fan.

You should always install sound attenuators behind the fans. Moreover, you can also utilize them in main ducting, elbows, T pieces, and air dampers, among other applications.


In conclusion,  we can say that it is crucial to install sound attenuators for HVAC systems. They are handy and quite useful

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