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Ventilation is the renewal of air in the house through a natural or forced flow of outside air through the house. Fresh air is supplied and polluted air is discharged.

Ventilation is essential for a healthy indoor climate. In many homes in the Netherlands, the indoor climate is not in order because moisture and dirt in the air are insufficiently removed. This can lead to mold formation and health problems such as allergies, irritation of mucous membranes and respiratory problems. By properly ventilating your home you ensure that 'dirty' air leaves the home and there is a supply of clean air. This ensures a healthy indoor climate.

What types of mechanical ventilations are there?


Is my home suitable?

​There are several ways to reduce heat loss through ventilation. The options depend on which ventilation you have now: via natural means (valve windows and grilles) or a ventilation system with mechanical exhaust.

  • Place a ventilation unit with heat recovery against an outside wall in the living room. You save energy and gain comfort.

  • Make your mechanical ventilation system demand-driven with sensors in the different rooms. If there are few or no people in a room, there is automatically less ventilation (and therefore less heat loss).

  • Take balanced ventilation with heat recovery for the entire home. This is an option if you are going to redecorate your whole house.

  • Replace the ventilation box (the 'exhaust motor') of your mechanical ventilation system with a ventilation heat pump. This allows you to recover heat from the ventilation air. You use it for your heating or hot water.

Natural ventilation

Natural ventilation

Natural ventilation uses air flows that are caused by natural variations in temperature (from the living room to the bedroom, for example) and other physical factors. In simple terms, we also call this “draft”. Basically, fresh air comes in from the outside and dirty air goes out from the inside without the intervention of a mechanical device. Ventilation is created through openings in the wall or windows (folding windows, grilles, air pipes) or through seams and cracks, for example around window frames or eaves. Dirty air is vented to the outside via the same route.


  • No electricity consumption 

  • No sound from any system

  • No maintenance


  • Uncomfortable: feeling of cold and draft

  • Higher heating costs because cold air has to be heated again

  • Sometimes susceptible to burglary

  • Sound from outside


Adding a regular ventilation grille in a new frame costs €110 to €220. 

Mechanical ventilation

Mechanical ventilation 

Without mechanical ventilation to provide fresh air, moisture, odors, and other pollutants can build up inside a home. Mechanical ventilation systems circulate fresh air using ducts and fans, rather than relying on airflow through small holes or cracks in a home’s walls, roof, or windows. Homeowners can breathe easier knowing their home has good ventilation. 


  • Better Indoor Air Quality:  indoor air can be many times more polluted than outdoor air, and the average American spends 90 percent of the day inside. Ventilation systems can significantly improve a home’s air quality by removing allergens, pollutants, and moisture that can cause mold problems.

  • More Control: when homes rely on air flow through walls, roofs, and windows for ventilation, there is no control over the source or amount of air that comes into the house. In fact, air leaking into the house may come from undesirable areas such as the garage, attic, or crawl space. Mechanical ventilation systems, however, provide proper fresh air flow along with appropriate locations for intake and exhaust.

  • Improved Comfort: mechanical ventilation systems allow a constant flow of outside air into the home and can also provide filtration, dehumidification, and conditioning of the incoming outside air. 


  • Higher electricity bill

  • Sound 

  • Ventilation box maintenance required, such as replacing filters 

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