A ventilation system runs continuously, often for years, with nobody touching it. Filters clog, extract valves foul up, the heat exchanger fills with dust — and airflow drops without anything flagging it. The system still runs, but it no longer ventilates.
Periodic maintenance restores the original airflow rates. We strip, clean and measure: by the end of the visit you know what your system actually extracts, room by room, and whether that matches what it should be doing.
We work on mechanical extract systems (system C), heat-recovery systems (system D, MVHR) and mechanical ventilation in apartment buildings and small offices.
No legal requirement, but a genuine technical one
What the service covers
Filter replacement
New filters in the classes recommended by the manufacturer (typically ISO Coarse on extract and ePM1 on supply). We leave a spare set and note the exact reference for your future orders.
Unit and heat exchanger cleaning
Casing stripped down, impellers de-dusted, plate or rotary exchanger cleaned, condensate tray and drain checked.
Valves and grilles
Extract and supply valves removed, cleaned and refitted without altering their original setting — a frequently missed detail that unbalances the whole system.
Airflow measurement
Room-by-room measurement with a flow meter, before and after the work. Readings are compared with the design flow rates (NBN D50-001) and recorded in the report.
Electrical and mechanical checks
Motor, bearings, direction of rotation, humidity and CO₂ sensors where fitted, and the controls (switch, remote, home automation).
Service report
A written document covering the condition found, the readings taken, the parts replaced and our recommendations. Useful for a building manager, a landlord or a future sale.
How the visit works
- 1
Survey
We identify the system type and its installation date where known, and record airflow rates as found.
- 2
Cleaning
Unit, heat exchanger, valves, external grilles. Removable parts are cleaned off site where necessary.
- 3
Replacement
Filters as standard; any other parts only after you approve a quote.
- 4
Balancing and final readings
Re-balancing if needed, fresh airflow measurements, noise level check.
- 5
Report handover
We explain what was done, what to keep an eye on, and when the next service is due.
Frequently asked questions
How often should ventilation be serviced?
Manufacturers generally recommend a filter check every 3 to 6 months and a full annual service. On a busy road, with pets, or during building works, filters clog faster. After a first visit we tell you the realistic interval for your system.
What is the difference between system C and system D?
System C extracts stale air from wet rooms; fresh air enters through façade grilles. System D supplies filtered fresh air and recovers heat from the extracted air through an exchanger. Servicing a system D is more technical: two duct networks, two filter sets, an exchanger and a condensate drain.
Can I change the filters myself?
On many models, yes — and it is a good habit between services. We show you how and leave the exact reference. Cleaning the exchanger, re-balancing and measuring airflow, however, need specific equipment.
Is the work noisy or messy?
We use floor protection and a fine-filtration vacuum. The unit is usually in the loft, cellar or a plant room; work in living areas is limited to removing the valves.
How long does a service take?
It depends on the system and the number of valves. Typically half a day for an MVHR unit in a single-family house. We give you a precise estimate with the quote.
Available across all the municipalities we cover
Service areas
- Anderlecht
- Braine-l'Alleud
- Brussels
- Etterbeek
- Forest
- Ixelles
- Leuven
- Ottignies-Louvain-la-Neuve
- Schaerbeek
- Tervuren
- Uccle
- Vilvoorde
- Waterloo
- Wavre
- Woluwe-Saint-Lambert
- Zaventem
Related services
- Duct cleaningCleaning the valves achieves nothing if the ductwork behind them is fouled. We treat the duct along its full length.
- Ventilation repairDiagnosis first, repair second. We only replace a unit when that is genuinely the right call.
- Ventilation installationA good installation is decided before anything is fitted: duct routing, sizing, unit location. The rest is assembly.
A question about this service?
Describe your system: we tell you whether this service is the right answer to your situation, or whether something else is needed.