Why choose Avenir Renovations?
Why install a single-flow VMC?
The single-flow VMC is a ventilation system that mechanically extracts stale air from humid rooms (kitchen, bathroom, WC, laundry), while fresh air enters naturally through grilles located in the joinery of living spaces. It is a simple and economical solution to ensure continuous and controlled ventilation.
Ensure good indoor air quality
Insufficient ventilation promotes the accumulation of pollutants, humidity, and CO₂. The single-flow VMC allows for constant air renewal, even without opening windows, for a healthier environment on a daily basis.
Avoid humidity and mold
By regulating the humidity in the most sensitive rooms, the VMC prevents condensation, mold, paint peeling, and preserves the integrity of insulating materials. It is essential in a renovated or well-sealed home.
Make a controlled investment
The single-flow VMC is easy to install and less expensive than double-flow systems. It integrates well into both light renovations and new constructions, while ensuring better thermal and hygienic comfort.
Types of single flow VMC
There are two main variants of single flow VMC. The choice depends on your expectations regarding regulation, energy savings, and humidity management.
Components of a single flow VMC system
A complete system includes:
- A motorized extraction unit (usually in the attic or a false ceiling)
- A duct network connecting the vents to the rooms to be ventilated
- Extraction vents (bathroom, kitchen, WC...)
- Air inlets in the frames (living room, bedrooms)
- A mechanical or hygroregulated control system
Our teams ensure the study of the necessary flow rate, the complete installation, the balancing of the flows, and the commissioning.
What is the price of a single flow VMC in Belgium?
The cost of a single flow VMC depends on the type of system chosen (self-regulating or hygro-regulatable), the number of rooms to be ventilated, the building configuration, and any necessary adjustments (false ceiling, openings, grills...).
Main variation elements
- Total area to be ventilated
- Type of outlets (hygro-regulatable, silent, decorative...)
- Duct network (length, diameter, insulation)
- Technical accessibility (attic, floor, crawl space)
- Additional work (openings, electrical supply, creation of access hatches)
Average prices in Belgium
| Type of single flow VMC | Average price including tax (supply + installation) |
| Self-regulating single flow VMC | 1,500 to 2,500 € |
| Hygro-regulatable single flow VMC | 2,000 to 3,500 € |
| Insulated duct network | 400 to 900 € |
| Openings / wall finishes | 150 to 400 € |
| Maintenance and cleaning of the unit (annual) | 100 to 150 € |
We always provide a free and personalized quote after a complete on-site technical visit.
Why call on Avenir Rénovations Belgium?
By entrusting your project to our team, you benefit from:
- A personalized airflow diagnosis
- The installation of a system compliant with Belgian standards
- A balanced and quiet commissioning
- Support for the maintenance and durability of the system
- Advice for integration into the PEB certificate
- A help with assembling your regional grant application
Integration of the single-flow VMC in an energy renovation project
In a high-performance renovation, ventilation is a crucial step. Even though the single-flow VMC does not recover heat, it allows:
- To renew the air without opening windows
- To limit uncontrolled energy losses
- To guarantee healthy indoor air, without humidity
- To protect insulating materials and wall coverings
It contributes to improving the PEB score, and to the thermal balance of the housing.
What regional aids are available for single flow ventilation in Belgium?
Single flow ventilation can benefit from regional aids, mainly if it is integrated into a comprehensive project or an energy audit.
- Wallonia: Housing Grant (mechanical controlled ventilation category)
- Brussels: Renovation Grant (hygienic and humidity-regulating ventilation)
- Flanders: Mijn Verbouwpremie (as part of centralized ventilation)
The amounts vary according to your income, the system's performance, and the housing composition.
Request your free quote for a single flow ventilation system
Do you want to improve air quality and protect the health of your home without breaking the bank? Choose a reliable, quiet, and well-sized single flow ventilation system, installed by certified professionals.
Contact Avenir Rénovations Belgium for a free technical visit and to obtain your personalized quote, with no obligation.
FAQ – Single flow ventilation and energy renovation in Belgium
Is a single flow ventilation system sufficient for an energy renovation?
Yes, in many cases. The single flow ventilation, especially humidity-regulating, is a reliable and economical solution to ensure effective air renewal in a renovated home. It helps maintain healthy air, remove humidity, and protect insulating materials, while remaining compatible with the requirements of a high-performance energy project.
Can one benefit from a regional grant for the installation of a single flow ventilation system?
Yes, under certain conditions. In Belgium, some energy renovation aids may include ventilation, notably:
- In Wallonia, through the Housing Grant
- In Brussels, through the Renovation Grant
- In Flanders, in some cases with the Mijn Verbouwpremie
The installation must be carried out by a certified professional and be part of a comprehensive renovation or based on a housing audit.
What is the difference between a self-regulating and a humidity-regulating single flow ventilation system?
- Self-regulating: the air flow is constant, regardless of needs. It is a simple and economical system.
- Humidity-regulating: the flow varies according to humidity levels. It optimizes air exchanges, limits losses, and offers better energy performance.
The humidity-regulating version is recommended for energy renovation.
Does a single flow ventilation system consume a lot of electricity?
No. A single flow ventilation system consumes on average between 30 and 80 kWh/year, which is about 5 to 10 € per year. It is a very low energy-consuming system, especially when equipped with a low-consumption motor.
Is it necessary to maintain a single flow ventilation system?
Yes, but maintenance is light. It is recommended to:
- Clean the extraction vents every 6 months
- Check the extraction unit every year
- Dust the air intake grilles in the frames
Regular maintenance ensures silent, efficient, and durable operation.
