MVHR Filters

MVHR filters

Customer Reviews

Orginalus kokybiški filtrai, malonus aptarnavimas ir konsultacija

Mykolas Tamulynas

Facebook review

Patys geriausi atsiliepimai. Užsakytų filtrų grąžinimas, jei neteisingus užsakėte, galima grąžinti nemokamai.

Jūrate Jokubauskienė

Google review

Greitas ir kokybiškas aptarnavimas. Geras kainos/ kokybės santykis. Rekomenduoju!

Ingrida Baltuškienė

Google review

Pirkome rekuperatoriaus filtrus internetu, viskas buvo sklandu, puslapiu patogu naudotis, prekes gavome itin greitai.

Monika Bijeikytė

Google review

Super aptarnavimas, nuoširdžiai rekomenduoju apsilankyti!!!

Pavel Koliato

Facebook review

Patenkintas dėl to kad įmonė labai operatyviai ir sklandžiai veikia

Anatolij Drozdovič

Google review

Need Help? Start Here.

We’ve gathered answers to the most common questions about our products and services. If you can’t find an answer here, please contact us directly.

Which Systemair SAVE models (VTR 150, 275, 300, 500, 700, VSR 200) does your filter range cover?

We stock filters for the entire Systemair SAVE range — one of the most widely installed lines of residential and light commercial heat recovery systems in Europe, made by one of the largest publicly listed HVAC manufacturers. The range covers the most popular models: VTR 150, 275, 300, 500, 700, as well as VSR 200. The exact model and variant code (e.g. VTR 300, SAVE VTC 500) is shown on the sticker on the unit's front panel — this is the most reliable way to choose the right filter.

What filter classes are used in Systemair SAVE VTR units?

Most SAVE VTR/VTC models come equipped with two filter classes:

M5-class filter for extract air
F7 (ePM1) class filter for supply air

Some economy ("BF") variants use a simpler G3 filter instead of M5, so it's worth checking your unit's filter class on the old filter frame or in the technical documentation before ordering. As a large-scale manufacturer, Systemair maintains very precise filter housing dimensions across all production batches — important when choosing a compatible filter for a tight fit.

How often should SAVE VTR or VSR filters be replaced?

The standard interval is every 3–6 months, depending on air pollution, pets and the number of people in the household. Systemair SAVE units are used in both large commercial buildings and homes to the same engineering standards, so the residential filter is also designed to withstand continuous, reliable operation. Regular filter replacement maintains stable airflow and protects the heat exchanger from premature clogging, especially in the intensively used SAVE VTR 500 and VTR 700 models with higher airflow rates.

Is it worth choosing a compatible filter instead of the original Systemair SAVE filter?

Yes. Since Systemair filter housings are manufactured with high precision and consistency across all SAVE VTR/VTC batches, a compatible filter of the correct M5/F7 class and correct dimensions fits snugly and performs exactly as effectively as the original — with no air leakage around the edges. The difference is usually only in price: compatible filters cost less, especially when buying a set (M5+F7 together). The most important thing is to accurately specify your VTR/VSR model code, since different variants (e.g. VTR 300 and VTR 700) have different dimensions.

Can I order a multi-year supply of Systemair SAVE filters at once?

Yes, ordering multiple sets several years ahead is a popular choice among SAVE VTR and VSR owners who'd rather order filters once a year than remember to do it separately every 3–6 months. Such bulk orders are usually cheaper per unit than buying one at a time. Before ordering a larger quantity, be sure to confirm your exact VTR model code (e.g. VTR 500 or VTR 700), as filter dimensions vary between different SAVE variants.

Which Vallox models (90 SE, 101 MV, 350 SE, ValloPlus 850 MV) does your filter range cover?

We stock filters for a wide range of Vallox models — from older series widely installed in Finland and across Northern Europe (e.g. Vallox 90 SE, 101 MV, 350 SE) to newer, digitally controlled ValloPlus units (e.g. ValloPlus 850 MV). The exact model name and airflow variant is shown on the front panel next to the digital display — this is the most reliable way to choose the right size filter.

What filter classes do Vallox MVHR units use?

Most Vallox and ValloPlus models come with the following filter set:

Two G4-class filters — one for extract air, one for outdoor air
One F7 (ePM1) class filter — for supply air

This differs from some other manufacturers who use M5 on the extract side — in Vallox's design, a simpler but more frequently replaced G4 filter does that job instead. This combination meets Finland's strict indoor air quality requirements for cold-climate housing, while keeping pressure drop across the heat exchanger low.

What does the filter notification on the Vallox control panel mean?

Vallox's digital controllers assess filter contamination based on one or two indicators:

The number of operating hours elapsed
On some models, the pressure difference across the filter

This is a useful reminder, but it's also worth checking the filter visually and assessing airflow manually, especially in the first year after a new unit is installed, when the actual rate of contamination isn't yet known.

Do all ValloPlus models use the same size filters, or does the size depend on airflow?

No — filter dimensions within the ValloPlus range vary according to the unit's airflow class, so higher-performance models (e.g. ValloPlus 850) use larger filters than more compact residential variants. To ensure an exact fit, you need to refer to the specific model name and airflow variant shown on the front panel — the series name "ValloPlus" alone isn't enough to choose the correct size.

Is there an activated carbon filter for Vallox units in homes near busy roads?

Yes, many Vallox models offer an activated carbon supply-air filter layer as an addition to the standard G4/F7 filtration — it helps absorb vehicle exhaust odours and urban pollution before the air enters the home. This is a popular choice for flats near busy streets, though such a filter generally needs to be replaced at a similar frequency to the standard one, as the carbon layer's absorption capacity also depletes over time.

Which Wolf CWL MVHR models (150, 225, 300, 400, 2000) does your filter catalogue cover?

We stock filters for the Wolf CWL range — the main residential heat recovery ventilation line from this German manufacturer, often installed together with Wolf heating systems. The catalogue covers both compact models (CWL-150, CWL-225) and higher-performance variants (CWL-300, CWL-400, CWL-2000). The exact CWL model code is shown on the sticker on the unit's front panel.

What filter classes are standard in Wolf CWL units?

CWL models typically use two-stage filtration in line with German indoor air quality guidelines:

M5-class filter for coarser particles
F7 (ePM1) class filter for fine particles

Filters of both classes fit the same filter housing with no additional modifications, so you can choose the more budget-friendly option without changing the holder itself.

Does pairing a Wolf CWL unit with a Wolf heating system change how often filters need maintenance?

From a filter-maintenance perspective, ventilation and heating functions operate independently, but in combined Wolf systems the recovery unit often runs continuously to support overall home climate control. Because of this, it's worth checking CWL filters towards the shorter end of the standard 3–6 month interval rather than waiting for the maximum period. This is especially relevant in winter, when ventilation intensity combined with heating tends to be higher than in summer.

Do smaller Wolf CWL-300 units use the same size filters as larger CWL models?

No — filter dimensions within the CWL range depend on the unit's capacity, so the CWL-300 uses a smaller filter than the larger CWL-400 or CWL-2000 models. Before ordering, be sure to check your exact CWL variant on the front panel sticker, since the series name "CWL" alone doesn't guarantee the right size — a filter ordered for the wrong model simply won't fit into the housing.

Can I order a whole year’s supply of Wolf CWL filters at once?

Yes, ordering a full season's or even a year's worth of CWL filters in one go is a common choice, especially for those who already have a maintenance schedule for their Wolf heating system and want to plan everything together. Ordering several sets at once usually brings the per-unit price down compared to buying one at a time. All you need to do is specify your exact CWL model code so that every filter in the set fits without any issues.

How do I find the right filter for my Zehnder ComfoAir unit (160, 180, 200, 350, 375, 550, Q350)?

The fastest and most accurate way is to check the exact ComfoAir model code on the sticker on the unit's front panel: models 160, 180 and 200 are more compact and common in flats, while the 350, 375 (ERV), 550 and Q series (Q350, Q450, Q600) are higher-performance and more common in houses. If there's no sticker or it's been peeled off, simply remove the existing filter and measure its width, height and thickness — this lets you find an accurate match even without knowing the model name.

What filter classes are used in the different Zehnder ComfoAir models?

The filter class depends on the specific model's size:

ComfoAir 160/180/200 — two G4-class filters, for both supply and extract air
ComfoAir 350/375/550 and the Q series (Q350/Q450/Q600) — a G4-class filter for extract air and an F7 (ePM1) class filter for supply air

The F7 class captures fine particles, including pollen, which is why many households with allergy sufferers choose not to swap it for a cheaper option, even if the unit allows a lower class.

Why do Zehnder ComfoAir filters need to be checked more often during pollen season?

Because the F7-class supply-air filter is specifically designed to capture fine airborne particles, including pollen, it fills up faster in spring and early summer than during the rest of the year. Even while keeping to the standard 3–6 month replacement interval, it's worth visually checking the filter's condition monthly during pollen season — this helps maintain stable airflow and prevents allergy symptoms from worsening indoors.

Do the Q350, Q450 and Q600 models use the same size filters?

No — filter dimensions in the Q series change along with the model number, so the Q350 uses a different size filter than the Q450 or Q600, even though all three follow the same G4/F7 filtration logic. Always check your exact Q model on the front panel before ordering, rather than assuming sizes are the same across the series — a filter of the wrong size simply won't fit the housing.

Where in Lithuania is the best place to buy Zehnder MVHR filters — original or compatible?

Both original and correctly chosen compatible filters work equally effectively, provided the filter class (G4 or F7) and exact dimensions match — both types are made to the same ISO 16890 standard. When ordering online, the most important thing is to check your ComfoAir or Q model code in advance so the filter is delivered without errors. Compatible filters are typically noticeably cheaper than original Zehnder products, which is why many buyers choose them as a more economical yet equally effective alternative.

How do I know which filters fit my Airobot AIRBOX unit?

The Airobot AIRBOX model name is usually printed on the label on the unit's front panel, or shown in the settings menu of the AIRBOX app. Since Airobot builds compact, demand-controlled heat recovery units with built-in CO2 and humidity sensors, the extract and supply air filter housings are standardized across most generations of the domestic AIRBOX. If the label has worn off over time or is no longer legible, the most reliable approach is to measure the old filter in millimetres (length, width, height) and use those dimensions to find the matching filter in our catalogue.

What filter class is used in Airobot heat recovery units?

Most Airobot AIRBOX units run on a two-stage filter set that meets the ISO 16890 standard:

on the extract side – a coarser G4/M5 class filter
on the supply side – a finer F7/ePM1 class filter

Because Airobot's sensors continuously adjust airflow based on real-time air quality readings, the filters can clog faster during more intensive periods (parties, cooking, humid weather), so it's worth checking them a bit more often than the usual 3–6 month interval.

Does a clogged filter throw off Airobot’s smart sensors?

Yes. Airobot's demand-controlled algorithm makes its operating decisions based on stable airflow readings, which it interprets together with the CO2 and humidity sensor data. A clogged filter reduces airflow and can force the system to run the fan at a higher speed than actually needed – increasing noise and energy use. Replacing filters on a regular schedule keeps the smart-control logic accurate and lets the unit run on less electricity.

Is it worth choosing compatible AIRBOX filters over original ones?

Yes – our ISO 16890 certified compatible filters for Airobot AIRBOX units usually cost noticeably less than the manufacturer's original filters, while matching the same G4/M5 or F7/ePM1 filtration classes and dimensions. Since the filter material and housing size are identical, filtration efficiency and airflow don't suffer – the savings simply come from not paying extra for the original brand name on the packaging.

Can I use a higher-grade (HEPA-type) filter in my Airobot AIRBOX unit?

Many AIRBOX housings technically allow a higher-grade F9 or H13 HEPA-type filter to be used on the supply side instead of the standard F7/ePM1, capturing much finer particles – pollen, ambient pollution or the finest dust. This is worth considering for households with allergy or asthma sufferers. Before ordering such a filter, it's worth checking the pressure drop tolerance of your specific model, since a denser filter material puts a somewhat higher load on the fan.

Which Atrea heat recovery units do the filters you sell fit?

We carry filter sets for the widely used Atrea Duplex series – the most popular residential and small commercial heat recovery units in Central and Eastern Europe. If you know your unit is labelled Duplex but aren't sure of the exact variant (e.g. Easy, Basic, RD5, RD6 control versions), the most accurate way to pick the right filter is to measure the existing filter's length, width and height and compare them with the dimensions listed in our catalogue.

How often do Atrea Duplex filters need to be replaced?

Atrea's manufacturer recommendations for Duplex filters cover a few points:

check the filters every 3 months
replace them at least twice a year, even if they look clean
watch for the maintenance reminder shown on the RD5/RD6 controller display, which is triggered once the pressure drop across the filter increases

Following this on-screen reminder rather than a fixed calendar date gives a more accurate result, matched to the actual air quality conditions in your space.

Can I use a higher-grade filter in my Atrea Duplex unit to reduce allergies?

Most Atrea Duplex units accept both the standard G4/M5 class filter and the higher-grade F7/ePM1 (in some cases F7 ePM1 70) filter in the same housing, without any additional modifications. If you or a family member suffer from pollen or dust allergies, upgrading the supply air filter to F7 class is one of the simplest ways to improve air filtration at home without replacing the unit itself.

Can I add an activated carbon filter to my Atrea Duplex unit to absorb odours?

Some Atrea Duplex variants support an additional activated carbon filter layer on the supply side, which helps absorb vehicle exhaust fumes, cooking odours and other volatile organic compounds (VOCs) before they enter the living space. This filter is added alongside, not instead of, the standard G4/F7 filtration, so before ordering it's worth checking the depth of your unit's filter compartment to make sure the extra layer fits inside the housing.

What should I do if the Atrea filter I ordered doesn’t fit my Duplex unit?

If the filter you ordered doesn't match your Duplex variant, we accept returns or exchanges as long as the filter is unused and still in its original packaging. The simplest way to avoid this situation in the first place is to send us the exact Duplex model code, or the filter's own dimensions, before ordering – this way you avoid a mismatch and the unnecessary wait involved in a return.

How do I find the right filter for my Blauberg heat recovery unit?

Blauberg makes a wide range of residential and commercial ventilation units – plate, enthalpy (e.g. the Komfort EC series) and rotary heat exchangers – so the fastest way to find the right filter is the model code on the unit's data plate, usually located near the electrical connections panel. If the plate is damaged or illegible, the filter's dimensions in millimetres will let you find the exact match in our catalogue by size rather than model name alone.

What filter class is standard in Blauberg units?

Residential Blauberg heat recovery units are usually equipped with a coarse G4 class filter on the extract air side and an M5 class filter on the supply air side – this provides good protection against dust and larger particles at an affordable price. On most models, the supply air filter can be upgraded to F7 class if a household member has an allergy to dust or pollen and needs better fine-particle capture.

Why do Blauberg units of the same model sometimes take different-sized filters?

Blauberg periodically updates the internal filter housings across different production batches, while the commercial model name often stays the same. If the filter you ordered doesn't fit even though the model matches the data plate, the most reliable approach is to measure the filter's physical dimensions rather than rely on the model number alone. This check ensures an exact match even in cases where units carrying the same name were slightly modified at the factory.

How much can I save by buying compatible Blauberg filters instead of original ones?

Our ISO 16890 certified compatible filters for Blauberg units usually cost noticeably less than the manufacturer's original filters, since you're not paying extra for branded packaging. The filtration class, dimensions and airflow figures match the OEM specification, so you get the savings without any drop in indoor air quality or heat recovery performance.

Do I need tools or a technician to replace filters in a Blauberg unit?

No – most residential Blauberg heat recovery units are designed so the filters can be accessed without any tools:

open the front or side cover by hand
pull out the old filter
slide in the new filter and close the cover

The whole process usually takes just a few minutes and doesn't require calling in an installer – any homeowner or apartment resident can change the filters themselves.

Which Brink series do you supply filters for – Renovent Excellent, Renovent Sky or Flair?

We have a full range of filters for the most popular residential Brink series:

Renovent Excellent (including the 180, 300 and 400 models)
Renovent Sky
Flair (including the Flair 225 and 325 models)

All three series are widely used in Lithuania too, and you'll usually find the model name on the label under the front cover, right next to the filter compartment. If the label isn't visible, the best option is to send us the exact model number or the filter dimensions so we can find the right product for you.

Where can I buy Brink filters in Lithuania, and do they fit the Renovent Excellent 300 and Flair 325 models?

We keep filters for all the main Brink series in stock, including Renovent Excellent 300, Renovent Excellent 400 and Flair 325, and ship them all over Lithuania. For each model, the filters are matched to the unit's exact dimensions, so it's important to state the full model name at the time of ordering (e.g. "Flair 325", not just "Flair"), since different variants of the same name can differ in filter size or configuration.

What filter class is recommended for Brink units?

Brink heat recovery units typically use an M5 class filter for coarser particles and an F7 (ePM1) class filter for fine dust and pollen on the supply side – this matches the Dutch indoor air quality recommendations that most Brink models are designed to. Since Brink units are often installed in newer, well-sealed homes, the filters sometimes last closer to 6 months, unless you live near a busy road or a construction site.

Do all Renovent Excellent, Renovent Sky and Flair models use the same size filter?

No – although all three series share the same M5/F7 filtration logic, filter dimensions differ between the Renovent Excellent, Renovent Sky and Flair series, and often between different power variants within the same series too (e.g. Excellent 300 and Excellent 400). Always choose your filter based on the exact series and model name, and when in doubt, check the dimensions of your existing filter instead of guessing based on the Brink brand name alone.

How fast do you deliver Brink filters?

We ship Brink filters all over Lithuania, and most orders reach the customer within a few business days. Since a clogged filter gradually reduces airflow and can make the heat recovery unit run less efficiently, we recommend ordering a new set a little before the planned replacement date is due – this way you avoid a period where the unit is running with an overly saturated filter.

How do I find the right filter for my Brofer heat recovery unit?

Since Brofer heat recovery units (e.g. the RDCD series of plate exchangers) are sold in several different configurations, the safest way to find the right filter is to measure the extract and supply air filter panels directly (length × width × height in millimetres) and compare them with our sizing catalogue. The model code on the label on the unit's front cover will also help narrow the search down to the exact product faster.

What filter classes fit Brofer units?

Residential Brofer heat recovery units usually use the standard M5 and F7 class filter combination, in line with the ISO 16890 standard applied across most European heat recovery systems. Both our original-specification and compatible filters are made to the same tolerance requirements, so choosing between them doesn't affect filtration efficiency or airflow.

How often do Brofer filters need to be replaced?

For Brofer units, the standard recommended interval is 3–6 months, and during the first year after installation it's worth checking the filters more often to see how quickly they clog in your particular environment. For households with pets, or where renovation or construction work is going on nearby, it's advisable to aim for the shorter end of the interval – around 3 months – rather than the full six.

How should I store spare Brofer filters so they don’t lose their properties before installation?

To keep unopened Brofer filters fit for installation, follow a few simple rules:

leave them in the original packaging until you're ready to install them
store them in a dry, room-temperature space
keep them away from direct sunlight and moisture

Filter material that's left unwrapped for a long time can absorb ambient moisture, which slightly reduces its ability to trap dust even before the filter is put into use.

How do I find the right filter for my MVHR unit?

To find the correct filter for your MVHR unit, you first need to identify the brand and model of your system. You can usually find this information on a label attached to the unit itself. Alternatively, consult the technical data in the maintenance manual.

If you’re unsure about the brand or model, there’s another way to find the right filter: remove the existing filter and measure its length, width, and height. Then, search by size in our online shop. Our filter listings include detailed specifications to help you match the right one.

If you're still not sure, feel free to contact us - send us the filter’s measurements, photos, or any other details, and we’ll be happy to help you find the right match.

Does using a compatible filter instead of an original one void the warranty on my Brofer unit?

Using a correctly sized, ISO 16890 compliant compatible filter does not void the mechanical or heat exchanger warranty on a Brofer unit, since the filter is considered a normal, regularly replaced consumable part rather than a structural component of the unit. Manufacturer warranty terms generally only require that the filter match the specified class and dimensions – not that it carry the original brand name.

How do I replace the filters in my MVHR? Where can I find guides and manuals?

Replacing filters is generally a simple, do-it-yourself task with no special tools required. Most of our filters come with detailed manuals or video instructions, available in the “How to change” tab on each product page. Simply find your filter and check that section for step-by-step guidance.

Does Defro make MVHR units, or only heating equipment?

Defro is best known as a manufacturer of biomass boilers and fireplaces, but its range also includes the Defro AIR line – residential heat recovery ventilation units, often installed in the same house alongside Defro heating equipment. Defro AIR filters are measured and classified the same way as filters for other manufacturers' MVHR units, so identifying the model from the label on the unit or measuring the filter directly both work equally reliably.

What filter classes are used in the Defro AIR unit?

Defro AIR units typically use two-stage filtration, following the industry-standard M5/F7 combination:

a coarser filter that protects the heat exchanger from dust and debris
a finer F7-class filter for the supply air stream

When buying filters, it's also worth checking the ISO 16890 class (e.g. ePM10 or ePM1), which today is often listed alongside the older EN 779 designation in the user manual.

How often should I replace the filters in my MVHR?

We recommend replacing the filters every 3-6 months, to ensure optimal air quality and system performance.

However, replacement frequency may vary depending on factors such as:

Air pollution levels (e.g. urban vs rural areas);
Allergies or respiratory sensitivities;
Indoor pets or smoking;
Dust from nearby construction sites.

If your system includes a filter change indicator, follow its alerts. Otherwise, check the filters visually – if they appear very dirty or clogged, it's time to replace them.

Can I replace the Defro AIR filters myself, without a technician?

Yes, the Defro AIR filter compartment is designed for front or side access, and removing the old filter and fitting a new one usually requires no tools. Simply unscrew the cover or release the latch, pull out the old filter, check its condition, and insert the new one in the same orientation (arrow pointing in the direction of airflow). If you're unsure of the exact steps for your specific model, it's worth checking the manufacturer's user manual – the procedure is similar across all Defro AIR models.

How often do Defro AIR filters need to be changed, and is it worth buying a year’s supply at once?

The usual recommendation is to check the filters every 3 months and replace them when you notice reduced airflow or increased noise – typically 2–4 times a year, depending on outdoor air pollution and the number of occupants. Buying a year's supply (2–4 sets) at once is a convenient way to make sure you're never caught without a filter at the wrong moment, and buying several sets together usually works out to a lower price per unit than buying one at a time.

Is there an activated carbon filter option if the Defro AIR unit is installed next to a biomass boiler?

When a Defro AIR unit is installed close to a biomass boiler or fireplace, the outside air intake sometimes picks up a smoky smell. In that case, a supply filter with an activated carbon layer helps absorb some of the volatile smoke particles and odour before the air enters the rooms. This filter is fitted as an additional stage alongside the standard M5/F7 filter set, not in place of it, so the main particle filtration is not compromised.

What is the difference between G3, G4, M5, M6, F7 class filters? What filter class do I need?

Filter class refers to the size and quantity of airborne particles a filter can capture. In general, the higher the classification, the more effectively the filter removes fine particles such as pollen, dust, and other pollutants from the air.

For incoming outdoor air, it’s generally recommended to use higher-class filters. However, we always suggest following the manufacturer’s guidance and using the specific filter sets outlined in your unit’s eco-commissioning documentation.

For more information, take a look at our comprehensive guide to filter classes for heat recovery units.

Which Electrolux models (e.g. EPVS-200, EPVS-350) do you sell filters for?

Electrolux residential MVHR units are among the most popular in the Baltic and Nordic countries, and our range covers the standard models from this manufacturer, including the EPVS-200 and EPVS-350 series. If the plate with the model name on the unit is hard to read or has come off, the most reliable way to find the right filter is to measure the old filter in millimetres (length, width, thickness) and compare it with the dimensions listed in our catalogue, rather than relying on the model number alone.

Are Electrolux ventilation filters the same as filters for other Electrolux appliances?

No – Electrolux is a large brand spanning many product categories, so filters for home MVHR (heat recovery ventilation) units are completely different from the filters used in other Electrolux products, such as:

vacuum cleaners
kitchen range hoods
air purifiers

When looking for the right filter, go specifically by your MVHR unit's model (e.g. the EPVS series) rather than a generic Electrolux household appliance filter – they are not interchangeable in either size or mounting.

Which filter class should I choose for an Electrolux MVHR unit?

Electrolux MVHR units most commonly use an M5-class (coarser) filter together with an F7 or ISO ePM1-class (finer) filter. In urban conditions, or if there are people with allergies in the home, an F7-class supply filter is often chosen, as it retains pollen and fine dust better than a standard M5. Both classes fit the same filter holder slot, so switching from M5 to F7 requires no additional modifications.

Why are original Electrolux filters more expensive, and do compatible alternatives work just as well?

The price of original Electrolux filters mostly reflects branded packaging and the distribution chain, rather than the filtration properties themselves. The compatible filters we offer are made to the same M5/F7 (ISO 16890) specification and to exactly the same dimensions, so filtration efficiency and airflow are no different from the original. The only real difference is price, which is usually noticeably lower when buying a compatible filter directly from the manufacturer without a brand markup.

Do Electrolux MVHR filters have an activated carbon layer for odours and VOCs?

Standard Electrolux MVHR filters are designed to capture particles (dust, pollen, fine solid particles), not to remove odours. For homes near busy traffic streets, or where strong kitchen or outdoor odours are noticeable, we offer an additional supply filter with an activated carbon layer – it is fitted as an extra stage alongside the regular M5/F7 filter, not as a replacement for it, so particle filtration remains unchanged.

How do I identify my Ensy MVHR unit (e.g. AHU 300) to order filters?

Ensy is a Norwegian manufacturer, and the model label on its residential MVHR units, such as the AHU 300 series, is usually located near the service hatch or the filter compartment. If the label is missing or unreadable, the quickest way to find the right filter is to measure the length, width, and thickness of the current filter in millimetres and compare them with the dimensions listed in our catalogue. This method works reliably even when the exact model name can't be determined.

What filter class is standard in Ensy MVHR units?

Most Ensy models, including the AHU 300, come with two filters in the same housing cavity:

an F7-class filter for supply air
an F7 or M5-class filter for extract air, depending on the model

For those wanting extra odour control, an activated carbon filter is available for some Ensy models. Before ordering, it's worth checking the exact filter class stated in your unit's user manual, as it can vary between AHU series variants.

Where can I find the Ensy MVHR user manual, and when does it say to change the filters?

Ensy MVHR user manuals are usually available on the manufacturer's website by specific model (e.g. the AHU 300 ceiling or floor-standing variant), and they specify the recommended filter check interval as well as what the control panel indicator means when it reminds you to change the filter. If you can't find the manual, or it's not in Lithuanian, follow the general rule of thumb – check the filters every 3 months and replace them sooner if you notice weaker airflow or increased noise.

How often do Ensy filters need to be changed?

The usual recommendation is to check Ensy filters every 3–6 months, and to replace them when the control panel shows a warning or you notice weaker airflow or a stronger smell indoors. During the cold season, when the MVHR unit works harder to recover heat, the filters can clog somewhat faster, so it's worth checking them earlier than your usual schedule in winter. For summer houses or rooms visited only occasionally, it's convenient to arrange repeat deliveries matching your usual replacement interval.

Original Ensy filter or a compatible alternative – is it worth choosing the cheaper option?

Compatible Ensy filters are made to the same F7/M5 filtration class and identical dimensions as the originals, so air cleaning efficiency and fit remain the same. The difference is essentially just price – original Ensy-branded filters are usually more expensive due to packaging and distribution through official dealers, while a compatible alternative lets you save money, especially if you replace filters several times a year. The main thing is to check that the alternative matches the exact dimensions and class for your specific AHU model.

Which Flexit models (Nordic S3, S4R/S6R/S7R, etc.) do you sell filters for?

Flexit is one of the most popular MVHR manufacturers in Norway and the other Nordic countries, and our range includes filters for the most commonly used residential models – Nordic S2/S3, S4R/S6R/S7R, S3R/K3R, and the UNI series. The model name is usually printed on the front panel label, right above the filter access opening. If you can't read the name, the filter dimensions (length, width, thickness in millimetres) are the most reliable way to find the right product in our catalogue.

What filter class does Flexit recommend for the S series MVHR units?

Flexit's S-series units (Nordic S2/S3, S4R/S6R/S7R) are designed for a cold climate and typically come with an M5-class filter for extract air and an F7 (ePM1)-class filter for supply air. In some models, a second F7 filter is used instead of the M5, giving an F7+F7 set – the exact combination depends on the specific model, so it's best to check your unit's user manual or compare it with the set we list for each model.

Why do Flexit filters often need to be changed more frequently in winter?

Flexit heat exchangers are optimised to work in sub-zero temperatures, so during the cold season the unit often runs at a higher and steadier airflow to maintain heat recovery efficiency. Because of this more intensive operation, filters can fill up somewhat faster than in the warmer months, so it's worth doing an extra check in the middle of winter rather than waiting for your usual schedule. In Norwegian this is called “filterbytte” – filter changing – and the term is often mentioned in Flexit user manuals as well.

How do I replace the filter myself in a Flexit SL4R or similar model?

The filter compartment on Flexit MVHR units is reached by opening the front cover without any tools – usually just loosening the latches or screws by hand is enough. After removing the old filter, check the airflow direction arrow on the new filter's frame and insert it in the same orientation. If you're unsure of the exact steps for a specific model (e.g. SL4R), the manufacturer's user manual provides a detailed, photo-illustrated procedure – it's the same across the whole S/SL series.

Can I order Flexit filters in bulk for a homeowners’ association or several apartments?

Yes, we accept wholesale orders:

for apartment building homeowners' associations
for managers overseeing several buildings
for landlords with multiple Flexit units

A larger discount per unit applies above a certain quantity. Send us the models of your units and the quantity needed – we'll prepare a consolidated order and arrange a convenient delivery schedule, so there's always enough filters for every MVHR unit in the building.

Why don’t I see the name “Holtop” on my unit, even though I found the filters here?

Holtop is one of the world's largest manufacturers of heat exchanger cores and OEM components for MVHR units of all kinds, and its parts are used in many other brands' or regional manufacturers' units sold under an entirely different name. If you see a Holtop part number on your unit's core, fan block, or filter holder, even though the housing is labelled with a different brand, our Holtop filter listing is very likely to be an exact match.

What filter class is standard in Holtop-based MVHR units?

Holtop units are usually equipped with a G4 or M5-class coarser filter and an F7-class finer filter, following the same ISO 16890 principles applied across the European MVHR market. Depending on the model, both original Holtop filters and compatible alternatives are available – both are made to the same filtration class, so the difference is essentially just price and branding, not air cleaning performance.

How do I measure the filter if I can’t find the exact Holtop model in the catalogue?

Remove the filter and measure three dimensions in millimetres:

length
width
thickness

Holtop manufactures its filter holders to a fairly standardised set of sizes across its entire product line, so an exact dimensional match will almost always help you find the right replacement, even if the specific model name can't be determined.

Does using a filter matching the Holtop specification affect my unit’s warranty?

No – using a correctly sized filter that matches your unit's Holtop filtration class specification does not affect the warranty on the heat exchanger core or fan block, since that warranty covers manufacturing defects, not which brand of filter you use. What matters almost always is the correct size and filtration class, not the specific filter brand on the box.

Can I use a higher-class F9 or HEPA filter in a Holtop-based unit?

Many Holtop-based unit housings can accept a denser F9 or HEPA-class filter on the supply air side instead of the standard F7 – this retains finer allergen particles. Because denser filter material increases resistance to airflow, before upgrading it's worth checking your unit's fan capacity or technical manual, especially on smaller residential models, so that the unit doesn't start running noticeably noisier.

Which Itho Daalderop heat recovery units do you have filters for?

We supply filters for the two most popular Itho Daalderop series:

HRU (including the HRU ECO and HRU ECO 150/200/350 models) — a standalone balanced ventilation unit
WPU — ventilation integrated with a heat pump system

Both series are widely used in new-build homes in the Netherlands. You'll usually find the exact model code on a sticker under the unit's front cover, next to the filter compartment.

Which filter class fits the Itho Daalderop HRU ECO 350?

The HRU ECO 350 and similar HRU models usually come with two F7-class filters — one on the supply air side and one on the extract air side, although some variants use a simpler G4 filter on the extract side. F7 (ePM1) class captures fine dust and pollen, making it suitable for more sensitive households. Check the exact set (F7+F7 or F7+G4) against your specific model code, as different HRU variants can differ.

Does the WPU series’ integration with the heat pump change how often filters need maintenance?

The ventilation filters themselves are maintained independently of the heat pump function, but in WPU systems the ventilation runs continuously, supporting both heating and air quality. As a result, the filters can accumulate more running hours per year than in standalone HRU units — it's worth checking them more often, closer to the 3-month mark rather than 6 months.

What’s the difference between original and compatible Itho Daalderop filters?

Both options are made to fit the same HRU or WPU housing geometry and the same filtration class (usually F7):

Original filters — manufactured to Itho Daalderop's specifications, often more expensive
Compatible (equivalent) filters — made by other EU manufacturers to the same dimensions and ISO 16890 class, at a lower price

Using a correctly sized, correctly classed compatible filter does not affect the unit's warranty, since the filter is a regularly replaced consumable part, not a structural component.

How do I find out the exact model of my Itho Daalderop unit?

To order the correct filters, knowing just the series name (HRU or WPU) isn't enough — you need the full model code:

Open the front cover — the code is usually shown on a sticker next to the filter compartment
Check your installation documents or purchase invoice
If you can't find the code, measure the old filter (length, width, thickness) and compare it with the dimensions in our catalogue

The exact code ensures the new filter fits snugly into the housing and doesn't let unfiltered air leak in around the edges.

How do I find out the exact model of my Komfovent Domekt unit (e.g. R 400 V or R 300 V)?

The exact model code is usually shown in one of the following places:

On the data plate on the side or front of the unit, usually near the electrical connection or the control panel
On a sticker under the front cover, right next to the filter compartment
In the installation documents or on the purchase invoice

What matters is not just the series name (e.g. Domekt R) but the full code, including the power rating and letter designation (400 V C6, C6M, C8, etc.) — the exact filter size depends on it.

Are filters from the Domekt, Kompakt and Verso series interchangeable?

No, generally they are not. The Komfovent Domekt R, Domekt CF, Domekt S, Domekt P, Kompakt (REGO/RECU) and Verso series all have different filter housing shapes and sizes, and even within the same series (e.g. Domekt R 300 V and Domekt R 400 V) filter dimensions differ depending on the unit's power rating. The controller version (C6, C6M, C8) can also change the dimensions within the same model. Always choose a filter based on the exact model code, not just the series name.

How often do Komfovent filters need to be replaced?

The standard recommendation for Komfovent Domekt, Kompakt and Verso units is every 3–6 months, depending on filter loading according to ISO 16890. Check filters more often if:

you have pets at home, or there is construction or renovation work nearby
a family member is sensitive to allergens, especially during the flowering season
your home is in the city, close to busy traffic streets

Many Domekt and Verso controller displays show a filter replacement reminder based on running hours or pressure drop — this is a useful signal, but not a substitute for periodic inspection, since the controller doesn't always accurately capture how dirty the filter actually is.

What’s the difference between original and compatible Komfovent filters — is it worth choosing the cheaper option?

Both options meet the same requirements, but differ in a few practical respects:

Certification — both original and our compatible filters are tested according to ISO 16890 filtration classes
Manufacturing — Komfovent makes its original filters at its own factory in Lithuania, while compatible filters are made at other EU manufacturers' factories to the same class
Price — compatible filters are usually noticeably cheaper than originals
Precision — both are cut to the exact Domekt, Verso or Kompakt housing dimensions

Using a correctly sized, correctly classed compatible filter does not affect the unit's warranty, since the filter is a consumable part, not a structural component.

How do I replace Komfovent filters myself?

In the Domekt, Kompakt and Verso series, replacing filters doesn't require any tools:

Open the front cover or the filter compartment door
Note the airflow direction marked on the old filter's frame
Pull out the old filter and, if needed, clean any dust from inside the housing
Insert the new filter in the same direction and close the cover

The whole process takes just a few minutes, and most units don't need to be switched off beforehand — if you're not sure, check the user manual for your specific model.

Does Mitsubishi’s Lossnay technology require special filters?

Lossnay is the name of Mitsubishi Electric's heat exchange element, not of the filter itself, so Lossnay VL and LGH series units use standard G4 or F7 class filters, just like other heat recovery units. The name Lossnay simply helps you recognise the right ventilation product line when looking for filters. The exact filter size is confirmed by the model number on the unit's housing sticker.

Which filter class is used as standard in Mitsubishi Lossnay units?

Most residential Lossnay VL and LGH series units come with a G4-class filter as standard, designed to capture larger dust particles. Some models also offer an F7-class filter as a supply-air upgrade option, which is better at capturing fine dust and pollen. Before choosing, check which class fits your specific model, as not all Lossnay variants support the F7 upgrade.

How often do Mitsubishi Lossnay filters need to be replaced?

Lossnay units follow the standard 3–6 month interval, although many models have a built-in maintenance indicator that warns when airflow drops due to a dirty filter. It's worth treating this indicator as a useful reminder rather than the only criterion for when to replace the filter — especially in urban environments or near busy streets, where the filter gets dirty faster than the calculator suggests.

Do filters fit across different generations of Mitsubishi Lossnay units, or only within the same series?

Filter compatibility generally stays within the same series and the same housing generation, but Mitsubishi has changed internal filter dimensions in some model updates, even while keeping a similar product name (e.g. within the VL or LGH-RVX series). The safest approach is to choose a filter based on the exact model number, or, if you can't find it, to measure the old filter directly before ordering a new one.

Will switching from a G4 to an F7 filter noticeably reduce airflow or increase fan noise?

A properly matched F7-class filter is made for the same housing dimensions as the standard G4, so the change in air resistance is usually small and practically unnoticeable in everyday use. If you notice reduced airflow or increased noise after switching to F7, it usually means the filter needs to be checked more often — not that the F7 class is unsuitable for your unit.

I have a NIBE heat pump — does that mean I also have a NIBE ventilation unit?

Not necessarily. NIBE is best known for its heat pumps, but its ERS series ventilation units are often installed in the same house alongside a NIBE heating system — they belong to the same brand but operate independently. To identify the correct filter model, check the data plate on the ventilation unit itself, not on the heat pump.

Which filter class do NIBE ERS units use (e.g. ERS 20-250)?

NIBE ERS series units (10-400, 10-500, 20-250, 30-400, 30-600 and others) usually use a two-stage set:

G4-class filter — on the extract air side, for larger particles
F7-class filter — on the supply air side, for fine dust and pollen

Some models also offer an F7 filter with an activated carbon layer, which additionally absorbs odours. The filter compartment is accessed through the front cover, which often also covers the control panel.

Does the filter’s condition affect the heating efficiency of a NIBE system?

Yes — in integrated NIBE systems, ventilation air quality and heat recovery work together with the heat pump to maintain the indoor climate and control energy consumption. A dirty ventilation filter reduces airflow through the heat exchanger, forcing the system to work harder to maintain the desired temperature. Regularly replacing filters helps not only air quality but also your heating bills.

Can I buy the NIBE ERS supply and extract air filters together, or do I need to order them separately?

Yes — we sell the NIBE ERS supply (F7) and extract (G4) air filters as a set, since both are usually replaced at the same time, which saves you both time and an extra delivery fee. If you need to replace just one side ahead of schedule, the filters can also be ordered separately.

Where’s the best place to buy NIBE filters, and how fast is delivery?

We ship NIBE ERS filters throughout Lithuania, with delivery usually taking a few business days depending on your location. Since NIBE ERS units are often installed together with a NIBE heat pump, and both systems affect your home's microclimate, it's worth keeping a spare set of filters at home — this way you'll avoid any gap in air quality while waiting for a new delivery. Before ordering, check the exact ERS model number so the filter matches your unit precisely.

How do I know which filter fits my Oxygen heat recovery unit?

The exact model is printed on the front cover of the unit, next to the filter compartment – for example, X-Air C200, Easy C250E or Easy V400E. Oxygen's C-series units (C150, C150E, C200, C200E, C250, C250E) all use a single filter size, while the V-series splits into two groups: V200/V200E and V400/V400E/V500/V500E/V600 – each with its own filter size.

Check the model name on the cover
If the sticker has worn off, measure the current filter (length, width, thickness)

Either method lets you pick the exact matching set from our catalogue.

What filter classes are used in Oxygen heat recovery units?

Oxygen units come standard with an M5+M5 class filter set for general dust retention. For better protection against pollen and fine particles, we offer an F7+M5 anti-allergy set, and for tackling unpleasant odours – a Carbon+M5 set with an activated carbon layer.

All three options are made to fit the same filter cassette without any modifications – only the filter type changes, not the size.

What is MVHR?

MVHR stands for Mechanical Ventilation with Heat Recovery. It's a ventilation system that continuously extracts polluted, stale, or humid air and supplies fresh, filtered air into the premises. As the air flows through the system, a heat exchanger transfers warmth from the outgoing air to the incoming air - without mixing the two. This helps maintain indoor air quality while reducing heating costs and energy waste.

Do the Oxygen X-Air C200 and C200E use the same size filters?

Yes. The letter "E" in an Oxygen model name simply indicates a built-in electric heater for warming the incoming air – the unit's housing and filter compartment are identical in construction. That means the X-Air C200 and X-Air C200E use exactly the same size filters, and you can order them under either model name.

The same rule applies to the other pairs – C150/C150E, C250/C250E, and V200/V200E, V400/V400E, V500/V500E.

Is it worth choosing an equivalent filter instead of an original Oxygen one?

Yes – our equivalent filters match original Oxygen filters on all the parameters that matter:

Manufactured in the EU
Meet the same ISO 16890 filtration class standards (M5, F7)
Cut to the same dimensional tolerances

Since filters need replacing several times a year, the price difference adds up noticeably over a year, while filtration quality and airflow throughput don't suffer – which makes equivalents a rational choice for routine maintenance, not a compromise.

How often should Oxygen heat recovery unit filters be replaced?

The recommended standard replacement interval is 3–6 months, but the exact timing depends on the environment – in the city or near a road, dust builds up faster than in a rural area. An F7 class filter, which captures finer particles, usually needs replacing a bit more often than an M5, since its fibre clogs faster.

In spring and summer, during pollen season, it's worth checking the filter every 4–6 weeks, especially if there are people with allergies in the household.

How do I find the right filters for my Paul heat recovery unit (Climos, Novus, Focus)?

Paul heat recovery units are divided into several series – Climos, Novus, Focus and others – each with several airflow-capacity variants (e.g. Climos 200, Novus 300, Novus 450, Focus 200, Focus 250). The exact model is shown by a longer letter-and-number code on the front panel of the unit, not just the series name.

Since units within the same series name can have differently sized filter compartments depending on airflow capacity, you need to know the full model code or measure the current filter – that's the only way to guarantee an exact match when ordering.

What filter classes are used in Paul heat recovery units?

Paul units standardly use an M5 class filter for the extract/intake air and an F7 (ePM1) class filter for the supply air – this combination meets the requirements of passive house construction, where all fresh air enters solely through the ventilation system. Some models (e.g. Climos 200) also offer a simpler M5+M5 set without fine filtration.

An F7 filter captures pollen and fine particles better than an M5, so in passive houses, where windows are rarely opened, its effect on indoor air quality is especially noticeable.

What’s the best way to maintain my MVHR system?

In between filter replacements, it’s also a good idea to clean the inside of your unit. This helps maintain not only your health but also the performance and lifespan of your heat recovery system.

You can do this yourself by removing the filters and unscrewing the front cover. This gives you access to the heat exchanger, which can be cleaned with a vacuum or a soft cloth.

What is the Paul ISO Filterbox and how is it different from the recovery unit’s filter?

The Paul ISO Filterbox is a separate, duct-mounted filter box (usually DN160 in diameter) used for additional air filtration before or after the main heat recovery unit, rather than being an internal component of the unit itself. It's often installed in the supply air line when a higher class of filtration is needed – for example activated carbon or F9 level – that the main unit doesn't support.

The filter's size depends on the box's DN diameter, so when ordering you need to specify that diameter, not the heat recovery unit's model.

Can I vacuum clean my filters?

Some filters (such as wire-framed or coarse pre-filters) can be gently vacuumed to remove surface dust and extend their lifespan. If your unit's manual allows it, you can usually vacuum the filter up to three times before replacing it. Always avoid using high suction settings, and handle the filter with care to avoid damage.

Is it worth choosing an equivalent filter instead of an original Paul one?

Yes, as long as the filter is made to the same ISO 16890 standards and matches the original's dimensions exactly. Our equivalent Paul filters:

are manufactured in the EU from the same quality filtering fibre
are cut to the same tolerances as the original filter
fit without any modification to the housing

Since filters need to be replaced several times a year, and in a passive house they play a particularly important role in air quality, an equivalent lets you save money without reducing either filtration efficiency or the unit's operating reliability.

Can I wash my filters?

No, MVHR filters are not designed to be washed. Washing can damage the filter material, reduce its efficiency, and affect the shape, which may lead to poor fit and airflow issues. If you're looking to remove light surface dust, it's better to gently wipe the filter with a soft, dry cloth. For optimal performance, we still recommend replacing the filters regularly.

How often should Paul heat recovery unit filters be replaced?

The standard interval is 3–6 months, but in passive houses, where the recovery unit is the sole source of fresh air, it's recommended to check the filters more often – every 2–3 months, especially the F7 filter on the supply air side. A clogged filter not only worsens indoor air quality but also increases the load on the fan and energy consumption, since the unit has to work against greater resistance.

During pollen season (April–June), it's worth checking the filter every month.

Why is filter replacement so important?

Clean filters are essential for both your health and the performance of your ventilation system. Over time, dust, bacteria, and fungi can accumulate in the filters, the system, and the air ducts. If the filters become saturated, your MVHR unit has to work harder to maintain airflow - using more energy and increasing your costs.

Dirty filters can also reduce indoor air quality by allowing harmful particles and microorganisms to recirculate, which may negatively affect your health and well-being.

How do I find the right filter for my Recom heat recovery unit?

The simplest way is the model code on the front cover of the Recom unit, e.g. EPP3SE, 3S EPP or 3SR EC. This code tells you exactly which filter set fits your unit.

If the sticker has faded or become illegible over time, the filter can also be identified by simply measuring the current one – length, width and thickness in millimetres. You'll find both options, searching by model and by dimensions, in our catalogue's filters, so you can pick the right set even without knowing the exact model name.

Why do my filters get dirty so quickly?

Several factors can cause your MVHR filter to become contaminated faster than expected, including both environmental conditions and the type of filter used:

Outdoor air quality: if you live near busy roads, industrial zones, or construction sites, your system may pull in higher levels of dust and pollution. In these cases, filters can become saturated in less than two months.
Filter efficiency: higher-grade filters (such as F7 or ePM1-rated) capture finer particles, which improves air quality - but they may clog more quickly due to the higher amount of trapped pollutants.
Filter quality: low-cost or poorly made filters (especially those from non-EU sources) may have higher pressure drops, reducing airflow efficiency and requiring more frequent replacement. They can also increase energy consumption over time.
System airflow rate: running the MVHR system at more powerful airflow settings means a greater volume of air moves through the filters each hour, which can lead to faster filter contamination.

If you notice filters getting dirty unusually fast, it may be worth reviewing your filter class, local air conditions, or even upgrading to a multi-stage filtration setup.

What filter classes are used in Recom heat recovery units?

Unlike most other brands, which standardly use M5 class, Recom units are usually fitted with a G4 class filter – this catches larger particles (fluff, hair, coarser dust), and it's cheaper and quicker to replace. Some models also offer an F7 class filter on the supply air side – it captures finer particles and pollen.

G4 class is fine for basic protection, but for households with allergies it's worth considering an F7 set if your model supports it.

Why does an MVHR system use two filters?

MVHR systems typically use two filters, some models may even include three or four - depending on the design and filtration requirements.

Usually one filter is used for extract air and one for supply air, each serving a different purpose:

The extract filter captures dust and particles from the indoor air as it’s removed from your home. This helps protect the internal components of the MVHR unit and reduces buildup in the ventilation system.
The supply filter cleans the outdoor air before it’s brought into your premises. This improves indoor air quality and protects your health.

Using both filters ensures that your MVHR system remains efficient while maintaining a clean and healthy indoor environment.

How often should Recom filters be replaced?

Since the standard G4 filter is a coarser class, it clogs faster than M5 or F7 class filters, so in Recom units it's recommended to check the filters every 2–3 months and replace them once you notice reduced airflow or increased noise. The standard maximum interval is 3–6 months, but in a dusty environment or near a busy street it's worth checking more often.

Regular checks protect not only air quality but also the recovery unit's own heat exchanger from premature contamination.

Why do you only offer sets of 2 Blauberg filters instead of 3?

Initially, Blauberg MVHR units have three filters installed. The third filter is added temporarily during or shortly after construction to protect the main supply filter from construction dust and debris. It is intended to be removed once construction is complete and you move into the premises.

After that, the system is designed to operate efficiently with two filters: one for the extract air (stale indoor air going out) and one for the supply air (fresh air coming in). Using more than two filters during regular operation is unnecessary. So when replacing the filters, only the two main filters need to be changed.

Is it worth choosing an equivalent filter instead of an original Recom one?

Yes – our equivalent Recom filters are made to the same dimensions and ISO 16890 filtration class (G4 or F7) as the original manufacturer's filters, only manufactured in the EU and at a lower price. Since G4 class filters need replacing more often than M5/F7, the price difference becomes significant over a year.

If you're unsure of the exact size, send us the model code or the filter's dimensions before ordering – we'll check the match in advance.

Why are there 3 filters in the Vallox replacement filter pack?

Vallox systems use a three-filter setup to ensure optimal air quality and protect the system. Our replacement filter set includes two G4 filters and one F7 filter.

One G4 filter captures coarse particles from the extracted indoor air, protecting the system from dust and debris buildup. The second G4 acts as a pre-filter on the supply side, trapping larger particles such as insects and debris before they reach the main F7 filter. The F7 filter performs the greatest filtration function, capturing finer particles such as dust, pollen, and allergens, thereby improving indoor air quality.

This combination helps extend the system’s lifespan and maintain efficient performance.

Can I use a higher-class F7 filter in a Recom unit instead of the standard G4?

In most cases yes, if your Recom model has a filter cassette designed for it – check whether the manufacturer offers an F7 variant for your specific model, since not all Recom series support this. An F7 filter captures finer particles and pollen better than a standard G4, but the higher density also means greater resistance to airflow.

Before switching class, it's worth making sure the fan can cope with the increased resistance without reducing airflow.

Can MVHR filters help with allergies?

Yes. Using higher-grade filters (such as F7 or ePM1-rated filters) can significantly reduce allergens like pollen, dust mites, and pet dander, improving indoor air quality for allergy sufferers. Regular replacement is key to maintaining this benefit.

Which Salda heat recovery unit series do you carry filters for?

In our catalogue you'll find filters for the two most widely used Salda residential lines:

RIS series
Smarty series

Both series are especially popular in Lithuania and in other Baltic and Nordic countries, so we keep these filters in stock at all times. The series name and airflow capacity (e.g. RIS 400, Smarty 4X P) are shown together on the front panel of the unit – that's the easiest way to identify your exact model before choosing a filter set.

What’s the difference between EN 779 and ISO 16890 filter classes?

EN 779 and ISO 16890 are two different standards for classifying air filters. While they serve the same purpose, describing how efficiently a filter removes particles from the air, they use different testing methods and naming systems.

EN 779 (now outdated) used categories like G4, M5, F7, etc. ISO 16890, which replaced it, classifies filters based on their efficiency against specific particle sizes (PM10, PM2.5, PM1). For example, a filter that used to be called F7 under EN 779 may now be labeled as ePM1 60% under ISO 16890.

We include both classifications on our product pages to help you find the right match for your system.

How do I determine the exact model of my Salda Smarty unit (e.g. 2R Ver Plus)?

On Salda Smarty series units, the model code is usually made up of several parts – for example, "Smarty 2R Ver Plus" indicates the size group (2R), while "Ver Plus" marks a specific version with additional features. This whole code, not just "Smarty", is shown on the front cover or inside on the technical data plate.

Since filter size depends on the specific version, giving the exact model code when ordering lets you get the right size set straight away, without needing to measure the filter itself.

What is the difference between original and house brand products?

Original filters are made by or for the ventilation unit’s original brand, through certified production partners. They follow the brand’s specific manufacturing and packaging standards.

House brand filters, on the other hand, are made by trusted independent manufacturers who meet strict quality requirements. We work closely with our production partners and carry out our own quality control to ensure a precise fit and reliable performance. Since they’re not tied to a specific brand label, house brand filters are often more affordable - offering excellent value without compromising on quality.

What filter class is used in Salda RIS and Smarty units?

Salda RIS and Smarty units standardly use an M5 class coarse filter together with an F7 (ePM1) class fine filter on the supply air side – these classifications correspond to the ISO 16890 standard, under which the manufacturer marks some newer models directly with a percentage efficiency value (e.g. ePM1 55%) instead of the older M5/F7 notation.

Although the labelling differs depending on the model's year of manufacture, the filter's purpose is the same – M5 captures larger particles, F7/ePM1 captures finer particles and pollen.

Are the filters of the RIS and Smarty series interchangeable?

No – even within the same series, filter size depends on the unit's airflow capacity, so RIS or Smarty filters are not automatically interchangeable with each other. For example, the filter from a lower-capacity RIS model usually won't fit a larger unit in the same series.

Before ordering, always check the full model code on the unit or, if you're unsure, send us the dimensions of your current filter – that way you'll avoid having to send back the wrong size.

Is it worth choosing an equivalent filter instead of an original Salda one?

Yes – our equivalent Salda filters match the originals in filtration class (M5, F7/ePM1) and exact dimensions, but are manufactured in the EU and cost less. Since filters need replacing several times a year, and the RIS and Smarty series are especially popular in Lithuania, keeping equivalent filters in stock lets us deliver them faster than waiting for originals to arrive from abroad.

There's practically no difference in quality, as long as the filter is made to the same standards and fits your model exactly.

Does Samsung make MVHR units (heat recovery ventilation systems)?

Samsung is best known for consumer electronics and air conditioning, and its range of dedicated heat recovery ventilation (MVHR) models is much narrower than that of specialised MVHR manufacturers. Samsung-branded recovery units found in Lithuania are usually tied to broader air conditioning or "smart home" solutions. If your unit's data plate shows the Samsung brand, the most reliable way to find the right filter is to check the model code on the front panel, or simply measure the existing filter panel and choose a match based on the dimensions.

What filter classes do Samsung MVHR units use?

Most Samsung heat recovery units follow the same convention as most MVHR systems on the market:

M5-class filter for extract air
F7 (ePM1) class filter for supply air

The replacement filters we offer are cut to the same ISO 16890 dimensions and filtration class, so they perform exactly as effectively as the originals.

How often should Samsung MVHR filters be replaced?

The standard interval is every 3–6 months, though it's worth shortening in these cases:

There are pets in the home
There are allergy sufferers in the household
Nearby construction or renovation work is increasing the amount of dust in the air

Regular replacement not only maintains air quality but also protects the unit's heat exchanger and fans from excessive strain.

Does a compatible (non-original) filter work just as well as the original for a Samsung MVHR unit?

Yes — if the filter class (M5/F7) and dimensions match those specified by the manufacturer, a compatible filter filters the air just as effectively as the original, since both are made to the same ISO 16890 standard. The only real difference is price: because Samsung isn't a major manufacturer in this segment, its original filters can sometimes be harder to find and more expensive. The most important thing is to accurately identify your unit's model and filter dimensions before ordering.

How do I find the right filter if I don’t know the exact model of my Samsung MVHR unit?

First check the sticker on the unit's casing or front panel — it usually shows the full model code. If there's no sticker or it's been peeled off, remove the old filter and simply measure its width, height and thickness in millimetres — these dimensions let you find an accurate match even without knowing the model name. Since Samsung recovery units are found in Lithuania less often than more popular MVHR brands, we recommend confirming the dimensions before ordering so the filter can be sent out without delays.

Still Have Questions?

Support details to capture customers that might be on the fence.

High-quality replacement filters for all major MVHR ventilation systems

What are MVHR filters, and why are they important?

Types of filters in our offer

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Customer Reviews

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Which Systemair SAVE models (VTR 150, 275, 300, 500, 700, VSR 200) does your filter range cover?

What filter classes are used in Systemair SAVE VTR units?

How often should SAVE VTR or VSR filters be replaced?

Is it worth choosing a compatible filter instead of the original Systemair SAVE filter?

Can I order a multi-year supply of Systemair SAVE filters at once?

Which Vallox models (90 SE, 101 MV, 350 SE, ValloPlus 850 MV) does your filter range cover?

What filter classes do Vallox MVHR units use?

What does the filter notification on the Vallox control panel mean?

Do all ValloPlus models use the same size filters, or does the size depend on airflow?

Is there an activated carbon filter for Vallox units in homes near busy roads?

Which Wolf CWL MVHR models (150, 225, 300, 400, 2000) does your filter catalogue cover?

What filter classes are standard in Wolf CWL units?

Does pairing a Wolf CWL unit with a Wolf heating system change how often filters need maintenance?

Do smaller Wolf CWL-300 units use the same size filters as larger CWL models?

Can I order a whole year’s supply of Wolf CWL filters at once?

How do I find the right filter for my Zehnder ComfoAir unit (160, 180, 200, 350, 375, 550, Q350)?

What filter classes are used in the different Zehnder ComfoAir models?

Why do Zehnder ComfoAir filters need to be checked more often during pollen season?

Do the Q350, Q450 and Q600 models use the same size filters?

Where in Lithuania is the best place to buy Zehnder MVHR filters — original or compatible?

How do I know which filters fit my Airobot AIRBOX unit?

What filter class is used in Airobot heat recovery units?

Does a clogged filter throw off Airobot’s smart sensors?

Is it worth choosing compatible AIRBOX filters over original ones?

Can I use a higher-grade (HEPA-type) filter in my Airobot AIRBOX unit?

Which Atrea heat recovery units do the filters you sell fit?

How often do Atrea Duplex filters need to be replaced?

Can I use a higher-grade filter in my Atrea Duplex unit to reduce allergies?

Can I add an activated carbon filter to my Atrea Duplex unit to absorb odours?

What should I do if the Atrea filter I ordered doesn’t fit my Duplex unit?

How do I find the right filter for my Blauberg heat recovery unit?

What filter class is standard in Blauberg units?

Why do Blauberg units of the same model sometimes take different-sized filters?

How much can I save by buying compatible Blauberg filters instead of original ones?

Do I need tools or a technician to replace filters in a Blauberg unit?

Which Brink series do you supply filters for – Renovent Excellent, Renovent Sky or Flair?

Where can I buy Brink filters in Lithuania, and do they fit the Renovent Excellent 300 and Flair 325 models?

What filter class is recommended for Brink units?

Do all Renovent Excellent, Renovent Sky and Flair models use the same size filter?

How fast do you deliver Brink filters?

How do I find the right filter for my Brofer heat recovery unit?

What filter classes fit Brofer units?

How often do Brofer filters need to be replaced?

How should I store spare Brofer filters so they don’t lose their properties before installation?

How do I find the right filter for my MVHR unit?

Does using a compatible filter instead of an original one void the warranty on my Brofer unit?

How do I replace the filters in my MVHR? Where can I find guides and manuals?

Does Defro make MVHR units, or only heating equipment?

What filter classes are used in the Defro AIR unit?

How often should I replace the filters in my MVHR?

Can I replace the Defro AIR filters myself, without a technician?

How often do Defro AIR filters need to be changed, and is it worth buying a year’s supply at once?

Is there an activated carbon filter option if the Defro AIR unit is installed next to a biomass boiler?

What is the difference between G3, G4, M5, M6, F7 class filters? What filter class do I need?

Which Electrolux models (e.g. EPVS-200, EPVS-350) do you sell filters for?

Are Electrolux ventilation filters the same as filters for other Electrolux appliances?

Which filter class should I choose for an Electrolux MVHR unit?

Why are original Electrolux filters more expensive, and do compatible alternatives work just as well?

Do Electrolux MVHR filters have an activated carbon layer for odours and VOCs?

How do I identify my Ensy MVHR unit (e.g. AHU 300) to order filters?

What filter class is standard in Ensy MVHR units?

Where can I find the Ensy MVHR user manual, and when does it say to change the filters?

How often do Ensy filters need to be changed?

Original Ensy filter or a compatible alternative – is it worth choosing the cheaper option?

Which Flexit models (Nordic S3, S4R/S6R/S7R, etc.) do you sell filters for?

What filter class does Flexit recommend for the S series MVHR units?

Why do Flexit filters often need to be changed more frequently in winter?

How do I replace the filter myself in a Flexit SL4R or similar model?

Can I order Flexit filters in bulk for a homeowners’ association or several apartments?

Why don’t I see the name “Holtop” on my unit, even though I found the filters here?

What filter class is standard in Holtop-based MVHR units?

How do I measure the filter if I can’t find the exact Holtop model in the catalogue?

Does using a filter matching the Holtop specification affect my unit’s warranty?