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How can I reduce the noise of my ventilation system?

How can I reduce the noise of my ventilation system?
Posted on 23-12-2021 by Rachelle Broeren

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Why does my ventilation system make noise?

It is important to know where noise in your ventilation system is coming from, before you can reduce it. A ventilation system causes air to be moved and in doing so, vibrations are released. To do this, a mechanical ventilation system is equipped with a motor that also creates vibrations. Many of these vibrations produce noise and thus annoyance. The noise level can vary from one ventilation system to another.

How can I reduce the sound of my noisy ventilation?


  1. Make sure the ventilation system is properly placed.
  2. Attach air duct noice silencers to your ventilation.
  3. Choose the correct ducts for your ventilation system.
  4. Use the mode switch for your ventilation system or go for demand-controlled ventilation.
  5. Clean and maintain your ventilation system.
  6. Has the time come to replace your mechanical ventilation system?


TIP 1: Placement of the ventilation system

Have the ventilation system placed in a separate room, as far away from the living spaces as possible. To prevent noise in your ventilation system, you want to make sure it has a solid, stable background. When the fan is on, an unstable wall will cause more vibration, which in turn leads to more noise. If necessary, place rubber behind the fan to reduce vibrations. Also, get your ventilation system adjusted properly so that the right amount of air flows through the system. Incorrect adjustment can cause noisy vents.

TIP 2: Duct silencers ventilation system

Air duct noise silencers reduce the vibrations caused by the ventilation system. There are a variety of duct silencers available. A Sonodec acoustically insulated hose can be tailored to your own needs. A flexible silencer, is ready to use and can be attached to the ventilation system. It allows more flexibility in terms of installation.

The most noise comes from the ventilation system, so you should place the duct silencer as close as possible to the noise generator. The thickness and length of the silencer determine the amount of sound reduced. A long silencer reduces noise more effectively. It is important to ensure that the diameter of the duct silencer is equal to the diameter of the pipe or ventilation duct. Inno silencers, also called over-talk silencers, are placed behind a valve.

ATTENTION! Do not use acoustically insulated hoses or silencers from the connections on the WTW system to the outside. Instead use thermal insulated hoses, this prevents condensation.

TIP 3: Choose the correct ducts for your ventilation system.

Rigid ducts such as spiro pipes are smooth on the inside, which creates less resistance inside the pipe. Less resistance also means less noisy vents. There are also anti-static ducts that provide noise reduction, such as UniflexPlus and Ubbink Air Excellent. There is less chance for dust to get stuck in these ducts. If dust accumulates in the ducts, air is less able to pass through the duct and this causes more noise.

A mechanical ventilation system is suitable for connection to a cooker hood. However, make sure you choose a powerful model. It is also necessary to clean the inside of the ventilation system. It is important that new parts fit exactly on the system to reduce noise. Therefore, when replacing parts, make sure they are the right size and connection diameters.

ATTENTION! Do not connect your kitchen hood to a heat recovery system (WTW). If you choose to do so, you should take the system completely apart and de-grease it every year. The grease causes the thermal efficiency to drop significantly in a few years.

TIP 4: Use the mode switch or choose demand-controlled ventilation

Most ventilation systems have a mode switch that allows you to adjust the setting of the ventilation. The higher the setting, the harder the ventilation runs and the more noise it produces. At certain moments you can set the ventilation to a lower setting, for example when you are sleeping. There is also the possibility of demand-controlled ventilation. An automatic system with sensors ensures that ventilation is only used when necessary. Humidity and/or CO2 sensors continuously measure the air quality and increase the speed of a fan when the air quality requires it. The system ventilates only when it is needed, which reduces noise exposure and is also highly energy-efficient!

ATTENTION! Do NOT turn off your mechanical ventilation system! Turning off your ventilation system has harmful consequences for your home or your health, mold can develop due to the humidity in the air. Only turn off your mechanical ventilation in case of maintenance, fire or disaster.

TIP 5: Cleaning and maintenance of your mechanical ventilation

As mentioned in tip 3, dust can accumulate in the ventilation ducts and this causes more noise. The accumulated dust impedes the air flow. Dirt can also build up in your mechanical ventilation box. By regularly cleaning and maintaining your mechanical ventilation system, you reduce noise and ensure that your ventilation system will last longer. Read here how you can maintain your ventilation system.

TIP 6: Replacing your mechanical ventilation box

If the ventilation system is old, the motor may be worn out and therefore make more noise. We recommend replacing a ventilation system every 15 years. Not only due to the fact that the motor can be worn out, but also because the ventilation system then no longer works properly and uses more energy. It is wise to replace your mechanical ventilation every now and then for newer systems on the market that are a lot quieter and often more energy efficient.

How much noise does mechanical ventilation make

There is no set number of decibels to attach to the sound of a ventilation system, as the sound is affected by several factors. As mentioned in tip 4, your mechanical ventilation system has different settings. For example, a ventilation system at its lowest setting makes a noise of about 40 dB. A sound level of 50 dB is still considered pleasant for our hearing. At the highest setting, the sound of your ventilation system can reach 60 dB. This is comparable to an air conditioner or a normal conversation.

The resistance of your ventilation system also determines the sound intensity. Resistance is the amount of effort the ventilation system has to put in to blow air through the ducts. If your system has a lot of ducts and bends, it has a higher resistance and makes more noise. A lack of maintenance or cleaning of the ventilation system can also contribute to higher noise levels.

Does a noiseless ventilation system exist?

To get straight to the point; no, there is no such thing as a completely silent ventilation system. A ventilation system always contains a motor that makes noise and ventilation also involves the movement of air, which is never completely silent. The fan motor causes vibrations that reverberate through the ducting. There are silent ventilation systems on the market, which generate as little noise as possible.

What is a silent ventilation system?

So while a ventilation system will always make some noise, today most ventilation systems are quite silent, some just a little less than others. Ultimately, the difference is made in installation, connection and maintenance. We therefore advise you to look further than just "the most silent possible", for example the dimensions, capacity, controls, built-in and extra sensors that can be connected. It is often about the complete picture.

There are somesilent mechanical ventilation boxes on the market. Dhese are designed to make the least amount of noise. The ventilation systems of Orcon are considered the quietest mechanical ventilators. Also take a look at the documentation for each product and the properties listed. We always try to inform you as well and as completely as possible, also about the different decibels and other properties per product.

Conclusion and tips

  • Although a ventilation system does make noise, there are ways to reduce it in order to prevent noise pollution.
  • Placing your ventilation system on a solid background and adjusting it properly are important.
  • Use silencers to reduce noise in your ventilation system.
  • Make sure your ventilation system has the right ducts.
  • Do not forget the maintenance or cleaning of your ventilation system to reduce noise.
  • Replace your mechanical ventilation in time to decrease sound.
  • The sound of your ventilation system is determined by several factors.
  • More resistance in your ventilation system results in more noise
  • If you want to reduce the noise in your ventilation system, look at the whole picture and do not immediately go for the "quietest" option.
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