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Discover the benefits, costs and operation of ventilation system B. Clear explanations and tailored solutions for your home or business.
Ventilation system B supplies fresh air to your home in a controlled way. Unlike completely natural ventilation (system A), the supply openings are actively supported by a fan. The exhaust of used, humid air takes place naturally through grilles in wet rooms. This makes system B an interesting choice for those who want more control over air quality, without installing a fully mechanical exhaust system.
With ventilation system B, a fan draws in fresh outside air, filters it and blows it through ducts to the dry rooms: living room and bedrooms. The influx of purified air creates a slight overpressure. This overpressure pushes the used air naturally towards the wet rooms – bathroom, kitchen and toilet – where it exits via exhaust grilles. So the system is a combination of mechanical supply and natural exhaust.
Advantages:
Disadvantages:
The Flemish building code distinguishes four basic types, each with their own characteristics:
For a thorough comparison, it's best to read our separate page about the different ventilation systems.
The total price depends on factors such as the size of the home, the number of rooms to ventilate, the degree of insulation and the accessibility of the installation site. On average, you should budget between €1,500 and €3,000 for a basic installation, excluding any built-in zones and finishing. For an exact tailored price, it's best to request a non-binding quote from a certified installer.
System B can be installed in both new-build homes and existing homes. Because the exhaust is natural, you don't need an extensive duct network. However, space must be provided for the supply unit and the duct system to the dry rooms. In renovation situations, it is sometimes necessary to lower ceilings or walls to conceal the ducts, but that is less invasive than with system D.
For a consistently healthy indoor climate, regular maintenance is essential. Replace the filters at least twice a year and vacuum the supply grilles in the living areas. Have the fan and the ductwork professionally cleaned every two to three years. This prevents bacterial growth and keeps the system running efficiently.
In Flanders, ventilation is legally required in new homes and in major energy renovations. System B meets the EPB regulations, provided it is correctly dimensioned. For specific requirements per municipality, it's best to consult the Local Energy and Climate Pact or contact a ventilation expert in your region.
Your ventilation specialist in Flanders
Every home and business breathes differently. We translate complex systems into understandable solutions, so you can choose with confidence. Our installers are ready in your region.
We explain the technology clearly without complex jargon.
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Insight into the costs
The final cost depends on several factors. The size of the home plays a role, but also the number of rooms to ventilate and the current insulation condition. Our local experts are happy to visit you on site to provide a non-binding tailored price.
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