Last updated: October 12, 2026
Short answer: Your MVHR model is printed on the unit’s rating plate, a small sticker or metal label on the casing. On most units it sits on the top, next to the duct connections, or behind the front cover. Write down the full model name with every letter after it, then pick your brand and model on our MVHR filters page.
The filter warning light is on, the old filters are grey, and you want new ones today. Then the shop asks which model you have, and the installer who fitted the unit five years ago isn’t answering.
You’re not alone. Most people never look at their MVHR unit after it goes into the loft or the utility room. The good news: the exact model is written on the unit itself, and finding it takes about two minutes.
This guide shows where the model plate sits on the most common brands, what the letters and numbers on it mean, and what to do if the plate is missing or unreadable.
Why the exact model matters
Two units from the same brand can look almost identical and still take different filters. A few examples from our own range:
- Komfovent Domekt R 400 comes in six versions (F C6, F C6M, H C6, H C6M, V C6, V C6M), each with its own filter page.
- Systemair Save VTR 300 has a BF and a PF version with different filters.
- Brink Renovent HR 250/325 takes different filters with and without bypass.
The brand name alone is not enough. “Zehnder” or “Komfovent” narrows it down to dozens of filter sizes; the full model code narrows it down to one set.
Where to find the model plate, by brand
Before you start
- Switch the unit off at the control panel or the plug before you open any cover.
- Take a torch and your phone. A photo of the plate is easier to read than the plate itself in a dark loft.
- Look for words like Type, Model, Art. No. or Product code. The serial number is useful for the manufacturer, but you don’t need it to order filters.
Zehnder
ComfoAir Q350, Q450, Q600: fold down the black front flap and pull off the grey top cover. The plate is under the mains power cable connection. Zehnder has used two plate layouts over the years, so yours may look different from a neighbour’s.
ComfoAir 350 and ComfoD 350: the plate is on top of the unit, on the front plate.
ComfoD 250: on the side of the unit, level with the display.
Zehnder also puts the serial number on a green sticker on the unit’s cover. → Zehnder filters: ComfoAir 70, 160, 180, 200, 350/500/550, E350, Q350/Q450/Q600, Standard 300/375; ComfoD; EVO; WHR 930/950/960.
Komfovent
The serial number and model are on a label on the outside of the unit or on a plate fixed to the frame. The controller type (C6, C6M or C8) is on a separate label on the front of the control box, next to the app QR code.
Read the model name in parts, for example Domekt R 400 V C6M:
| Part | Example | What it tells you |
|---|---|---|
| Series | Domekt R / CF / S | R = rotary heat exchanger, CF = counterflow |
| Size | 400 | Unit size |
| Layout | V / H / F / U | V = all ducts on top, H = ducts on the sides, F = flat unit for a suspended ceiling, U = universal |
| Controller | C6 / C6M / C8 | Automation version, also printed on the control box |
On our site each layout and controller combination has its own page, so you need all four parts. → Komfovent filters: Domekt R, CF, S and P; Kompakt RECU and REGO; Verso R, CF and S.
Brink
Renovent Excellent and Renovent Sky: the identification plate is on top of the unit and shows the type, serial number and year of production. On the Excellent, look for:
- 4/0, 2/2 or 3/1: how many duct connections are on top and how many at the bottom.
- Left or right: the side the filters sit on, behind the filter door.
- “+”: the Plus version with an extended control board.
The Renovent Sky display only shows “HRU-appliance” in its info menu, so use the plate, not the screen. → Brink filters: Renovent Excellent 180, 300/400/500; Renovent HR 250/325 with or without bypass; Renovent Sky 150/200, 300; Flair 225, 325/400, 450/600.
Systemair
On Save units the type label is next to the external duct connections, with a second label inside the unit. It shows the product code, item number, serial number and production date.
Watch the letters after the size:
- L or R: which side the supply air connection is on, seen from the front.
- E: enthalpy (moisture recovery) version.
- BF / PF: two versions of the same size. VTR 300 BF and VTR 300 PF take different filter sets.
→ Systemair filters: Save VTR 100–700, VSR 150–500, VTC 200–700, VR 250; plus older VR, VX, VVX and VM units.
Paul
Novus 300/450: the plate is on the side with the air connections. L or R in the name gives the duct layout, and F means an enthalpy (moisture recovery) exchanger. → Paul filters: Novus 300/450, Focus 200, Climos 200.
Mitsubishi Lossnay
The name plate shows the product name and serial number. On VL-250/350 units the L-type mirrors the R-type, so the plate, filters and controller are on the opposite side. → Mitsubishi filters: Lossnay LGH-15RVX to LGH-100RVX, VL-250, VL-350, VL-500.
Other brands we stock
For these brands, look on the top of the unit, by the duct connections, and inside the filter or service door. Those three spots cover almost every unit.
| Brand | Series we have filters for |
|---|---|
| Airobot | L5, V3, V8 |
| Atrea | Duplex Easy, Easy2, EC5/ECV5, Pro, Pro-V, Slim |
| Blauberg | Komfort EC, Komfort Roto EC, Komfort Ultra EC, Reneo S |
| Brofer | LQR280, RDCD |
| Defro | DRX / OPTI V |
| Electrolux | EPVS-200/350/450, ERVX-150/250/350 |
| Enervent | Pinion, Salla (Compact) |
| Ensy | InoVent AHU-200 to AHU-700 |
| Flexit | Nordic CL2–CL4, S2/S3, S4; UNI 2/3/4; SL4R; Econordic W4/WH4 |
| FRÄNKISCHE | profi-air 180 sensor |
| Holtop | Eco-Smart ERV 2.5/3.5, XHBQ-D5 |
| Itho Daalderop | HRU ECO 150/200, 350 |
| Nibe | ERS 20-250 |
| Oxygen | Easy and X-Air C180–C250, V200–V600 |
| Recom | 2RT, 2SR, 3SR, 3SEF, 4RT, 4S(E), 4SR, 6S(E), 6SR, EPP2SE, EPP3SE |
| Salda | Smarty 2R V, 2X, 3X/4X; RIRS EKO 3.0; RIS; Tornado |
| Samsung | ERV 250, 350/500, 800/1000 |
| Siber | EVO 1/2, 3/4 |
| Vallox | ValloPlus 270/350/510/850; 51–280 MV/SE; Digit; ILMAVA; TSK Multi |
| Wolf | CWL-180, 300/400, F-150, F/T-300 |
| Xvent | Xflat 150–450, Xhouse 250/300, Xhouse3 350/500 |
Plate missing or unreadable? Four other ways
- The paperwork. The user manual, the installer’s handover pack or the commissioning sheet names the model on the cover or first page.
- The old filters. Many filters have the size printed on the frame or the media, for example 166 × 272 × 48 mm. Measure length, width and depth in millimetres if nothing is printed.
- The installer or the house builder. In a new-build home, the developer’s handover file usually lists the ventilation unit.
- Send us a photo. A picture of the whole unit, the duct connections and the old filters is often enough for us to identify it. Use our contact page.
Don’t rely on the control panel. On the brands we checked, the info screen shows the software version and filter hours, not the model name.
Supply and extract filters are not the same
Most units hold two filters, sometimes three:
- Supply filter: cleans the outdoor air before it enters your rooms. It is often the finer one, F7 or ePM1.
- Extract filter: cleans the air leaving the kitchen and bathroom before it reaches the heat exchanger. It is usually G4 or ISO Coarse.
The two can have different sizes, even in the same unit, and they are not interchangeable. When you change them, put each filter back on the side it came from. Not sure what G4, F7 and ePM1 mean? See our guide to MVHR filter classes.
Check the dimensions before you order
If the model code still leaves you between two options, compare the old filter with the dimensions on the product page. Length and width must match within a couple of millimetres. A filter that is too small lets air bypass it; one that is too large won’t close the door.
Order the right set in three steps
- Go to MVHR filters and pick your brand.
- Open your series and then your exact model, including the letters (V/H, L/R, C6/C6M and so on).
- Choose a full set (supply + extract) or single filters, and decide between original and our compatible house brand. Our article on alternative or original filters explains the difference.
Tip: save the model name in your phone or write it on the inside of the filter door. Next time, ordering takes a minute.
Frequently asked questions
Where is the model number on my MVHR unit?
On the rating plate, a sticker or metal label on the casing. Check the top of the unit, the side with the duct connections, and the inside of the filter or front door.
Can I order filters with just the brand name?
Usually not. One brand can use dozens of filter sizes. You need the full model, including letters such as V/H, L/R or the controller code.
What if my filters have no size printed on them?
Measure length, width and depth in millimetres and compare them with the product pages, or send us a photo of the unit and the old filters.
Are the supply and extract filters the same?
Not always. They often differ in filter class and can differ in size. Order them as a set for your model and put each one back where it came from.
Do compatible filters fit as well as the originals?
A good compatible filter is made to the same dimensions as the original for that model. Read how to tell a good alternative from a risky cheap one.
Found your model?
Pick your brand on our MVHR filters page and go straight to your unit. Can’t find it, or still not sure? Send us a photo through the contact page and we’ll tell you which set fits.
And once the new filters are in: don’t wash the old ones and put them back. Here’s why.