Servicing your Lemmens ventilation unit
Lemmens is a heat-recovery ventilation brand widely found in Belgium, in houses as well as small buildings. Its units are recognisable by name: HRglobal, HRmural, HR Flat, and the older CASA and Mural PX generations.
These are heat-recovery units. The service covers the filters, the exchanger, the fans, the condensate drain and the valve settings.
The Lemmens units we service
HRglobal (Up)
Main range, from houses up to large buildings.
HRmural (Up)
Wall-mounted version.
HR Flat
Flat version.
CASA, Mural PX
Previous generations, still in service.
Independent of the brand
What matters on a Lemmens
Very different sizes
An HRglobal 450 serves a house; an HRglobal 2000 or 4000 serves a building. We service the former by online booking at the listed price; large units in apartment buildings or offices are quoted.
The condensate drain
The exchanger produces water in winter. The trap and drain must stay clear and filled, or the unit whistles or overflows. We check them on every visit.
Lemmens-size filters
Each model takes its own filter sizes. We note the exact reference. Filters are not included in the price: you are told their cost before the visit.
What this service costs
One price per system, published before you book, with no questionnaire to fill in to get it. Anything out of the ordinary (a lot of valves, an unreachable unit, a system never opened) we tell you before the visit, never on the invoice.
Prices exclude VAT. 6 % on servicing in a private home over ten years old, 21 % otherwise.
What the service includes
Filter replacement, on request
Filters are not included in the displayed price: what they cost depends on the model. Ask for replacement when you book and we tell you the amount before the visit. We fit the classes recommended by the manufacturer (typically ISO Coarse on extract and ePM1 on supply) 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, optional
Room-by-room measurement with a flow meter, before and after the work, added for 15 € when you book. 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 parts replaced, our recommendations, and the measured airflow if you took the option. Useful for a building manager, a landlord or a future sale.
Prefer to change the filters yourself between services? Our catalogue lists the filters that fit each Lemmens model.
Frequently asked questions
Do you service large HRglobal units in apartment buildings?
Yes. It is not an online booking: we first look at the installation, then quote the service unit by unit, with a report for the managing agent.
Do I need a Lemmens-approved installer?
Servicing a ventilation system is not restricted to the brand's installers. If your unit is still under warranty, check its terms: some require regular, documented servicing. Our written service report is there for that.
How often should a Lemmens be serviced?
Manufacturers generally recommend a filter check every 3 to 6 months and a full service once a year. After a first visit, we tell you the realistic interval for your system.