My CMV is noisy: how do I fix the problem?

When a CMV (Controlled Mechanical Ventilation) buzzes and emits a purring noise or incessant whistling, it quickly becomes difficult to bear in the home. This installation is however essential in the house, because it allows good air circulation and avoids the risk of humidity and mold development. This makes the air healthier and more breathable for the whole family. Why is your CMV noisy? What to do to fix the problem? Our responses in this dossier.

Why is a VMC noisy?

In general, a CMV becomes noisy due to an installation fault, lack of maintenance or a fault in the equipment. It is generally recommended to call in a professional who will be able to check the condition of the turbines, ducts, air inlets and housing of the appliance. However, basic cleaning can be done very easily by you in order to maintain the installation and limit the risk of noise pollution.

The majority of the noises of a CMV come from very specific elements:

Lack of maintenance is the first reason. Over time, dust and dirt build up and clog the VMC circuit. If, however, the noise problem persists after cleaning a circuit, it is probably that its origin is to be sought elsewhere.

While operating, the engine emits more or less significant vibrations. These can impact the device and make the noise worse.

The nature of your CMV ducts is also important, as materials that are too rigid tend to drive engine noise. Softer ducts are quieter, but also easier to maintain.

An adjustment fault is also to be considered, because a badly adjusted CMV can be noisy. Make sure that the air flow is proportional to your room, make the necessary readjustments and adapt the ducts and ducts accordingly.

What to do in the event of a noisy VMC?

The solution to solving a noise nuisance problem linked to VMC necessarily depends on the source of the problem. A motor fault will not be solved in the same way as a bad calibration of the ducts or a clogged circuit, of course.

Here are our solutions to reduce the problems of noisy CMV.

Regulatory cleansing

Over time, the CMV becomes clogged with dust and dirt and the classic wear and tear of its components. Regular maintenance and cleaning are essential for proper operation. A clogged CMV will indeed be less efficient and more energy-consuming. You can regularly clean the air vents with your vacuum cleaner. You will unclog the ducts and facilitate the passage of air by this basic intervention.

An engine problem

If the engine in your CMV is at fault, it may be time to replace it. A badly positioned motor can cause noise nuisance due to vibrations, when it comes into contact with the casing or other elements of the VMC and in this case, rebalancing or better fixing may be sufficient. However, it can also be noisy in the event of manufacturing defect, wear or failure. If this is the case, be sure to replace the motor as soon as possible to avoid a fire.

A sheath problem

If the ducts are too tight or badly calibrated in relation to the air flow, the circuits must be adapted. The installation should be made more flexible by modifying the length of the ducts or by replacing the parts with more flexible models. It may also be necessary to replace some drilled or crushed sheaths with new models. Do not hesitate to opt for insulated ducts, which are generally less noisy than conventional ducts.

An adjustment problem

A badly adjusted VMC will certainly be noisy. When the air flow is disproportionate, and in particular too powerful, in relation to the system and the room, the risk of noise pollution is increased. Remember to properly adjust your device; it will thus be quieter, but also more efficient and less quickly clogged.