Using silencers to reduce the noise from inline fans

Many buildings have large HVAC systems to provide sufficient heating and cooling. They are important for air circulation but there is a downside to using them. This is the fact that they can be very noisy. The noise can be a big problem in some areas. Luckily, there is a solution. It is possible to create and install an inline silencer to tackle the noise.

Is it too loud?

Every HVAC system will generate some noise. Many systems won’t be overly loud and the noise will remain at a safe decibel. However, if the noise exceeds 70dB it can become very harmful.

The level of noise will depend on a number of factors. For example, the type and size of fan, length of ducts, and location will all have an impact. The size of the room and its acoustics matter too.

To get an accurate reading of the noise, you will need a dB metre. You should turn the fan on and then test the decibel level in front of the air flow.


There are a number of ways to reduce the noise from an inline fan. The best option is to choose a suitable silencer. This can fit into the duct and then dampen the noise. It will do this by utilising sound absorption material. The silencers can come in various shapes and sizes so they suit all kinds of systems. We design bespoke ones at Ventx to give our clients the best solutions.

Other options you can try to reduce the sound include:

  • Soundproofing the whole room
  • Insulating the ducts as well as the fan
  • Muffle the vents
  • Choose a speed controller so you can limit the fan’s rotation

Talk to us if you need an inline silencer

If you have a noisy HVAC system, regardless of the type of property, you can rely on us. We have a lot of experience at Ventx and design products for all kinds of needs. Our goal is to ensure every client is happy.

So, if you need help with an inline fan, please contact us.