Why choose Avenir Renovations?
Why choose a dual-flow ventilation system?
The dual-flow ventilation system simultaneously ensures the extraction of stale air and the supply of fresh air through a network of ducts and a heat exchanger. It allows for efficient ventilation while preserving the heat of the home.
Improve air quality without loss
Thanks to its filters, the dual-flow ventilation system supplies filtered air, free from dust, pollen, or outdoor pollutants. At the same time, it removes humidity and odors from service rooms. All this without opening windows and without letting in cold air.
Reduce energy loss
The heat exchanger of the dual-flow ventilation system recovers up to 90% of the heat from the extracted air to preheat the incoming air. This helps to reduce heating needs, which is essential in an energy renovation where every kWh saved counts.
Enhance daily comfort
The dual-flow ventilation system ensures a stable indoor temperature and avoids cold drafts caused by the direct entry of outdoor air. In summer, some models offer an automatic bypass function to blow cooler air during the night.
What regional aids are available for double flow ventilation?
The installation of a double flow ventilation system is eligible for energy renovation grants if it is:
- Part of a comprehensive project or through a housing audit
- Installed by a certified professional
- Accompanied by a system with certified performance
What are the advantages of a double flow VMC compared to a single flow?
| Criterion | Single flow VMC | Double flow VMC |
| Incoming air | Unfiltered, via frames | Filtered, mechanically supplied |
| Heat recovery | No | Up to 90% |
| Thermal comfort | Average | Excellent |
| Energy consumption | Low | Moderate, but offset by thermal gain |
| Investment | Lower | Higher, but more profitable in the long run |
What is the price of a double flow ventilation system in Belgium?
The cost of a double flow ventilation system is higher than that of a simple flow system due to the technical complexity, the double duct network, the heat exchanger, and specific adjustments.
Factors affecting the price
- Surface area of the home (m²)
- Number of outlets and circuits
- Quality of the exchanger (efficiency, noise, control)
- Necessary work: drilling, false ceilings, electrical supply
- Desired filtration level (standard or anti-allergenic)
- Accessories: sensors, thermostats, bypass, connected system
Average prices observed in Belgium
| Type of double flow ventilation | Average price including tax (supply + installation) |
| Standard system 85% efficiency | 4,500 to 6,500 € |
| High efficiency system > 90% | 6,500 to 8,500 € |
| Model with connected control | +300 to +800 € |
| Complete double duct network | 800 to 1,500 € |
| Annual maintenance (filters + inspection) | 100 to 250 € |
We provide a free and personalized quote after a technical on-site visit.
Components of a dual-flow ventilation system
A complete dual-flow system includes:
- A ventilation unit with a heat exchanger
- A double duct network (fresh air + stale air)
- Supply vents (living room, bedrooms, office...)
- Extraction vents (bathroom, kitchen, WC...)
- Air filters (G4, F7 as needed)
- An electronic control system (manual, automatic, connected)
Our technicians size each installation according to regulatory flow rates, areas to be ventilated, and building constraints.
Dual-flow ventilation: installation in renovation or new build
Although more complex to integrate than a single flow system, the dual-flow ventilation system can perfectly adapt to major renovations or well-insulated homes.
- In new builds: direct integration into the ceiling, ducts, and partitions
- In renovations: installation in false ceilings, attics, vertical technical ducts
- Centralized or decentralized systems depending on the housing configuration
We ensure a discreet, aesthetic installation that complies with Belgian air regulations.
Why choose Avenir Rénovations Belgium?
With our expertise, you benefit from:
- A custom sizing compliant with regulatory flow rates
- Certified high-performance products (thermal, acoustic, filtration efficiency)
- A seamless and controlled installation
- Support in maintenance and filter replacement
- A complete file for regional grants
- A quick, clean site compliant with energy performance standards
The double flow ventilation system in an energy renovation project
In Belgium, the double flow ventilation system is strongly recommended for low-energy or renovated homes with enhanced insulation. It allows you to:
- Ventilate without thermal loss
- Gain several points on the energy performance certificate
- Reduce heating needs
- Contribute to a homogeneous and quiet thermal comfort
Request your free quote for a double flow ventilation system
Do you want to improve your comfort, air quality, and energy performance of your home? Choose a high-efficiency double flow ventilation system, installed according to the rules of the trade.
Contact Avenir Rénovations Belgium for a free technical visit and to obtain your personalized quote, with no obligation.
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FAQ – Double flow ventilation system and energy renovation in Belgium
Is the double flow ventilation system suitable for an energy renovation?
Yes. The double flow ventilation system is one of the most efficient systems for ensuring continuous ventilation without losing heat. It allows you to recover up to 90% of the calories from the extracted air, which reduces heating needs. In a well-insulated home, it directly contributes to improving the energy performance certificate and enhancing overall thermal comfort.
Can you obtain a regional grant for a double flow ventilation system?
Yes, provided that the installation meets certain criteria. In Belgium, a double flow ventilation system with a certified heat exchanger can benefit from a regional grant if:
- It is installed as part of a comprehensive renovation project
- It is installed by a certified professional
- The flow rates are sized according to current standards
Available grants:
- Housing Grant (Wallonia)
- Renolution (Brussels)
- Mijn Verbouwpremie (Flanders)
Our teams assist you in the preparation of your administrative file.
What is the difference between a double flow and a single flow ventilation system?
- The single flow extracts stale air but brings in cold air through the grilles in the windows, which generates heat loss.
- The double flow extracts stale air and supplies preheated fresh air, thanks to a heat exchanger, which greatly improves comfort and energy efficiency.
Is the double flow ventilation system silent?
Yes, if it is well installed. Modern models have soundproof boxes and insulated ducts. A good balancing of the flow rates, appropriate sizing, and fine adjustments ensure very discreet operation, even in bedrooms.
Does the double flow ventilation system require a lot of maintenance?
No, but regular maintenance is essential to ensure its performance:
- Filter replacement: 1 to 2 times a year
- Cleaning of vents and ducts: every 2 to 3 years
- Inspection of the heat exchanger: periodically
We offer annual maintenance services to make management easier for you.
