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A ventilation system D ensures continuously fresh, healthy air and saves on your energy bill. Our local specialists advise, install and maintain your system throughout Flanders.
A ventilation system D is a mechanical balanced ventilation system with heat recovery. It uses a fan to exhaust stale air from humid rooms and simultaneously blows fresh, filtered air into living rooms and bedrooms. Thanks to a heat exchanger, up to 90% of the heat from the exhaust air is recovered and transferred to the supply air. This way you ventilate without heat loss.
Unlike system C, which only exhausts mechanically and supplies via vents, system D both supplies and exhausts mechanically. This gives you control over the amount of air and allows you to adjust ventilation to demand. The system is equipped with fine filters that capture pollen and fine dust, ideal for allergy sufferers. In Flanders, system D is mandatory for new-build homes that meet EPB requirements and is also highly recommended for major renovations due to its energy performance.
The heart of the system is the ventilation unit with heat exchanger, usually installed in the attic, basement or technical room. From this unit, air ducts run to humid rooms (kitchen, bathroom, toilet, utility room) for exhaust of stale air, and to dry rooms (living room, bedrooms, office) for supply of fresh air. Two fans in the unit ensure the airflows. The heat exchanger, a cross-flow or counter-flow exchanger, transfers heat from the exhaust air to the supply air. Then the fresh air is filtered and distributed.
Most systems have a bypass function: in summer, when the outside temperature is higher than inside, the heat exchanger can be bypassed so you can ventilate with cooler outdoor air without heating up the home.
System C exhausts mechanically and supplies naturally via window vents. It is simpler and cheaper, but you always feel drafts near the vents and heat is lost. System D offers heat recovery and filters the supplied air. For new construction, system D is the standard; for major renovations it is often the best choice if you aim for a low E-level. Want to understand the differences in detail? Read our comparison between system C and D.
The price depends on the size of your home, the type of unit (airflow rate, heat exchanger efficiency), the brand (such as Vasco, Renson, Zehnder...), and the complexity of installation. For an average single-family home of 150 m², you pay for a basic system D including installation from about €5,000 to €7,000. For a more luxurious version with higher efficiency, CO₂ control and app control, it can go up to €10,000. Request a no-obligation quote tailored to your project.
We strongly advise against installing a balanced ventilation system yourself. Installation requires specialist knowledge of airflows, duct airtightness, acoustic damping and EPB certification. Mistakes lead to noise, drafts, energy loss or an invalid EPB declaration. Always choose a certified installer, like ours, who has experience in your region.
Regular maintenance is crucial for efficiency and lifespan. Replace filters every 3 to 6 months (depending on pollution and filter class). Have the ducts inspected and cleaned at least every 2 years to prevent mould and resistance. We offer tailored maintenance contracts: discover our maintenance service.
Applications
From new construction to office, every project requires an appropriate ventilation approach. Discover how system D works in your environment.
In Flanders, system D is mandatory for new construction with high EPB requirements. We design the ventilation plan, install and certify.
For energy renovations towards BEN level, system D is often the best choice. We cleverly integrate the ductwork.
In apartments too, central or decentralised balanced ventilation is possible. We work together with the syndic.
For businesses we install ventilation systems D that meet standards for healthy indoor climate, with CO₂ control.
Service questions
As the only ventilation specialist with a truly local approach in Flanders, we have installers in all corners. Whether you live in Antwerp, Limburg or West Flanders, we come to your home for advice and installation.
Request your no-obligation quote now and discover which ventilation system D best suits your home or business. Our specialists visit you for free for a personal proposal.
