Noisy ventilation system

Certainly, insulating your home can prove useful for improving energy performance. Ventilating it is also of paramount importance to ensure the comfort of the occupants in the house.

Among the most popular systems, the VMC or Controlled Mechanical Ventilation offers several advantages. It effectively renews the indoor air of a dwelling. Even better, it prevents the appearance of mold stains on the walls by reducing humidity levels.

At some point, the device suddenly becomes noisy. If you want to learn more about the subject, we suggest you discover this article.

What can be the causes of noise emitted by a VMC and how to identify them?

It is not difficult to detect noise disturbances. They become increasingly disturbing especially as they appear at night when everyone is sleeping.

This problem is in most cases related to the device’s motor. Often fixed in a suspended ceiling or false ceiling, it is either poorly positioned or poorly installed. As a result, the vibrations it produces can travel up the ducts, generating unpleasant sounds.

In the worst case, this component of the VMC stops working. Therefore, its replacement must be planned to eliminate the disturbances.

A noisy VMC can also be explained by a defect or lack of maintenance. Dirt and dust accumulate over time and clog the device’s circuit.

If you do not take care of it, it will not only be noisy but also energy-consuming and less efficient. By cleaning the air vents using a vacuum cleaner, you can stop the noises.

If this issue persists despite maintenance, other causes must be sought elsewhere such as a duct problem. If the duct appears poorly sized or too tight, it is imperative to adapt the circuits.

To soften the installation, either you replace the model with a more flexible one, or you modify its length. It is also possible to use insulated ducts, as they are less noisy than classic versions.

A poor system adjustment can also be the cause of the sound discomfort. It could come from an airflow rate that is too high compared to the dimensions of the room.

What type of noise does a VMC usually emit and how can it affect the comfort of the home?

When your VMC is working properly, you even forget its presence in the home. But the moment a certain sound comes from the system, you will likely be bothered by the situation.

Most of the time, the device makes a humming noise that is hard to ignore. Otherwise, it emits unpleasant whistling sounds that quickly become unbearable in the home.

In any case, it is appropriate to find the origin of the problem and fix it as soon as possible. This certainly affects the comfort of all occupants.

Small or tall, man or woman, Mr. and Mrs. Everyone are not able to tolerate this discomfort. It can be a source of stress and tension at home.

To avoid getting to that point, it is important to call a professional to resolve the situation. Generally, you can entrust this task to an electrician or a heating and refrigeration technician.

How to reduce the noise emitted by a VMC to improve the acoustic comfort of the house?

If you do not have technical knowledge, it is safer to go through a professional. Otherwise, you risk worsening the situation.

By contacting a heating technician, his role is to identify the source of the problem and find an appropriate solution.

To carry this out, he checks the condition of the motor and the ducts. He also inspects the box inlets as well as the air intakes.

His actions depend on his diagnosis. If he sees that the airflow does not seem proportional to the room, he reduces it to stabilize it.

If the noise comes from the motor, he must examine its positioning. If it is poorly fixed, he just has to correct it and then rebalance it.

If the problem stems from its breakdown or wear, he is obliged to replace it permanently. A professional electrician can recommend a suitable and quality part.

If his diagnosis specifies problems related to the ducts, he can revise their length. It may also be that they are damaged or too rigid. They must therefore be replaced for good.

While waiting for its action, it is recommended to clean the ventilation outlet with a vacuum cleaner. Be sure to ventilate the room where the ventilation system is installed to eliminate humidity.

Source of noise	Intensity (dB)	Technical solution
Motor vibration	55	Silent blocks
Duct whistling	35	Clearing the duct
Air intake	40	Complete cleaning
Worn bearings	60	Motor replacement

What tools and equipment are necessary to carry out repair work on a noisy VMC?

With VMCs, one can say that noises are normal. But when they intensify, some important checks must be carried out. This issue is sometimes due to a lack of maintenance. Over time, the device ends up getting clogged.

Dust accumulates in the ducts, on the fins, or on the grilles of the ventilation outlets, which leads to an excess of unwanted decibels.

To get rid of them, you simply need a vacuum cleaner. Also consider cleaning the installation with soapy water. If the noises do not decrease, they result from a defective or broken motor.

Also, it sometimes happens that the device is poorly positioned, and this situation amplifies the emitted decibels. To eliminate them, use anti-vibration pads between the equipment and the floor on which it is placed.

If despite your efforts, the noise continues to bother you as much, it is recommended to use noise reduction devices. They mainly serve to block the sounds emitted by the ventilation.

When should you replace a noisy VMC?

You have already applied all the solutions mentioned above to eliminate the noises. However, you get no results. In this circumstance, it is appropriate to consider replacing the entire installation.

With recent versions of VMCs, they are designed not to exceed the threshold of 35 dB for a humid room and 30 dB for a living room. If your device’s motor exceeds these limits, it is time to change it as it is probably too old.

It should be noted that the motor problem can cause it to overheat. However, this also risks, in the worst cases, causing a fire.

Let us recall that a VMC can last between 10 to 20 years. This generally depends on the model, its maintenance, and its brand. It is essential to know its installation date to avoid making a mistake. If yours is approaching this threshold, try to replace it without delay.

Moreover, changing the installation provides countless advantages such as maintaining the balance of the ventilation system and the possibility of energy savings.

This decision also helps avoid problems caused by poor heating such as a very dry home or humidity. Besides that, the renovation project can be done at a low cost since it is possible to benefit from aids like MaPrimeRénov’.

How to choose a VMC that emits little noise to avoid acoustic problems in the future?

To prevent unpleasant nuisances from occurring, it is recommended to opt for a high-quality system. Modern installations generally do not present this kind of issue.

There are different types of VMC. You can choose between the single-flow VMC which is the most classic model. There is also the thermodynamic double-flow VMC and the single or double-flow hygro-adjustable VMC.

According to specialists, the latter represents the quietest ventilation system. Unlike other VMC versions, its ventilation flow is adjusted room by room according to the collected humidity level.

This installation adjusts its operation according to the air quality in the house. It operates at low flow when the air is sufficiently healthy at certain times of the day. In short, the ventilation emits no noise once the air is clean.

Currently, more and more major brands of hygro-adjustable VMCs offer devices providing better acoustic comfort. They are rarely offered at a low price. In any case, these models are well worth their cost.

FAQ

<!– wp:rank-math/faq-block {"questions":[{"id":"faq-question-1742401828204","title":"Why is my VMC making an abnormal noise?","content":"A VMC can become noisy due to duct clogging, a defective motor, or a mounting problem. Check if the ventilation grille is blocked and clean it regularly to prevent dust buildup.","visible":true},{"id":"faq-question-1742401834897","title":"How to reduce the noise of a whistling or vibrating VMC?","content":"If your VMC emits a whistle, it may come from a poorly fixed duct. Try tightening the mounting clamps or adding a foam gasket to dampen vibrations.
If it vibrates, place silent blocks under the motor to absorb noise and limit transmission to the walls.”,”visible”:true},{“id”:”faq-question-1742401851458″,”title”:”What to do if my VMC makes a bearing or tired motor noise?”,”content”:”If your VMC makes a rubbing noise or a motor that is straining, the bearings may be worn. Remove the casing and apply a drop of lubricant on the motor shaft.
If the noise persists, the motor may be at the end of its life: consider its replacement, especially if your VMC is over 10 years old.”,”visible”:true}]} –>