Mechanical ventilation only works properly if the system is also properly maintained. A dirty filter or a dusty vent can significantly reduce its capacity, while you may notice little at first. Below you will read how often the different components need attention.
Vents and extraction points: every few months
The vents in the kitchen, bathroom and toilet, and the ventilation grilles in windows or window frames, collect dust and grease. It is recommended to wipe these down every two to three months with a damp cloth or vacuum them. This is the simplest maintenance, but also one of the most important: clogged vents allow much less air through.
Filters: usually every six months
Many ventilation systems, especially balanced ventilation systems with heat recovery, have filters that keep the incoming air clean. These filters usually need to be replaced or cleaned every six months, depending on the type and the manufacturer's advice. A dirty filter not only reduces the air supply, but can also trap odors.
The ventilation box: annual check
It is best to have the ventilation box, with the motor that moves the air, checked once a year or inspect it yourself. Pay attention to strange noises, vibrations, or a motor that noticeably moves less air than before. Dust in the motor housing can reduce performance and shorten its lifespan.
Ducts: once every few years
The ventilation ducts themselves need maintenance less often, but over the years dust and sometimes grease still accumulate in the ducts, especially with the kitchen extraction. Professional cleaning of the ducts once every three to five years helps to maintain the airflow and prevent unpleasant odors.
Signs that maintenance is needed
Pay attention to signs such as a musty smell that does not go away, windows that fog up and no longer dry, a system that noticeably has to work harder to achieve the same result, or a clear increase in dust in the house. These are often signs that filters, vents, or ducts need a cleaning.
Why regular maintenance is worth it
A well-maintained ventilation system works more efficiently, is quieter, and ensures a healthier air quality in the home. Neglected maintenance of ventilation is one of the most underestimated causes of a stuffy or musty indoor climate, especially in winter when there is already less ventilation through open windows.
A simple maintenance schedule
It helps not to leave maintenance to chance, but to stick to a regular rhythm. For example, set a reminder every quarter to wipe the vents, check the filters every six months, and plan a time once a year to inspect the ventilation box. This prevents small delays from accumulating into a system that barely moves any air anymore.
If you live in a rented home, it is good to know that maintenance of the central ventilation system usually lies with the landlord, while cleaning the vents and filters is often something you do yourself. If you are unsure who is responsible for what, simply ask the landlord or the homeowners' association.
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