Zehnder ComfoAir 350 / 500 / 550 filter set G4+F7 (original)

Most Airobot AIRBOX installations run on a two-stage, ISO 16890-rated filter set:

• Extract side — coarse M5-class filter
• Supply side — finer F7/ePM1 filter

Because Airobot's sensors continuously adjust airflow based on real-time air quality, filters can load up faster during high-demand periods such as parties, cooking or humid weather, so it's worth checking them slightly more often than the standard 3–6 month interval.

Yes. Airobot's demand-controlled algorithm relies on stable airflow readings to interpret its CO2 and humidity sensors correctly. A clogged filter reduces airflow and can cause the system to run at higher fan speeds than necessary, increasing both noise and energy use — replacing filters on schedule keeps the smart control logic accurate.

The full model code is usually printed in one of a few places on your unit:

• On a nameplate on the unit's front or side panel, often near the power connection or control panel
• On a sticker inside the front cover, next to the filter compartment
• In your installation documentation or original purchase invoice

Any of these will give you the exact code needed to match the correct replacement filter, rather than relying on the series name alone.

Not as a general rule. Komfovent's Domekt, Verso and Kompakt (REGO/RECU) ranges each use different filter housing shapes and sizes, and even within the same series, filter dimensions can vary between compact and larger-capacity variants. Always match by your exact model code or measured filter dimensions rather than assuming a filter from one model will fit another.

The standard guidance for Komfovent units is every 3–6 months, in line with typical ISO 16890 filter loading. Consider checking sooner if:

• You have pets or nearby renovation or construction dust
• A household member is allergy-sensitive, especially during high-pollen season
• The property is in an urban area near busy roads

Most Domekt and Verso controllers also display a maintenance reminder based on running hours or pressure drop — treat it as a useful prompt alongside the calendar interval, not a replacement for it.

Both are built to meet the same requirements, but they differ in a few practical ways:

• Certification — both original and our compatible filters are tested to ISO 16890 filtration classes
• Manufacturing — Komfovent's originals are produced at their own facility in Lithuania, while our compatible alternatives are made elsewhere in the EU to the same standard
• Price — compatible filters are typically priced well below the Lithuanian-made originals
• Fit — both are cut to the exact Domekt, Verso or Kompakt housing dimensions

Using a correctly sized, correctly classed compatible filter does not affect your unit's warranty, since filters are a routine consumable part rather than a structural component.

Yes — on Domekt, Verso and Kompakt units, filter replacement is designed to be tool-free:

1. Open the front access panel or filter compartment cover
2. Note the airflow direction marked on the old filter's frame
3. Slide out the old filter and wipe down the housing if it's dusty
4. Insert the new filter in the same orientation and close the panel

The process typically takes just a few minutes, and most units don't require powering down first — check your manual if you're unsure.

Yes — our ISO 16890-certified compatible filters for Airobot AIRBOX units typically cost noticeably less than manufacturer-branded originals while matching the same M5/F7 filtration classes and dimensions. Because the filter media and housing size are identical, there's no drop in filtration performance or airflow, only in price.

Many AIRBOX housings can accommodate a higher-grade F9 or H13 HEPA-class filter on the supply side without modification, capturing significantly finer particles than the standard F7/ePM1 filter. This is worth considering for households with severe allergies or asthma, though it's worth checking your specific model's pressure-drop tolerance first, since denser filter media can slightly increase fan load.

We stock replacement filter sets for the Atrea Duplex range, the brand's most widely installed residential and light-commercial MVHR series across Central and Eastern Europe. If your unit carries a Duplex nameplate but you're unsure of the exact variant, measuring the filter's length, width and height is the most reliable way to match it in our catalogue.

If a filter you've ordered turns out not to match your Duplex variant, we accept returns or exchanges as long as the filter is unused and in its original packaging. Sending us your exact Duplex model code or the measured filter dimensions upfront is the easiest way to avoid a mismatch in the first place.

Some Atrea Duplex variants support an additional activated carbon filter layer on the supply side, which helps absorb traffic fumes, cooking odours and general VOCs before they enter the home. It's typically fitted alongside — not instead of — the standard M5/F7 filtration, so check your unit's housing depth before ordering.

Many Atrea Duplex units accept both standard M5 and higher-grade F7/ePM1 filters in the same housing without any modification. If you or a family member suffers from pollen or dust allergies, upgrading the supply-side filter to F7 is one of the simplest performance upgrades available for these units.

Atrea's guidance for Duplex filters covers three checkpoints:

• Check filters every 3 months
• Replace them at least twice a year, even if they still look clean
• Watch for the RD5/RD6 controller's on-screen maintenance reminder, which triggers once pressure drop across the filter rises

Following that on-screen prompt rather than a fixed calendar date gives the most accurate result for your specific air quality conditions.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Airobot units are identified by the model name printed on the unit's front panel or in the AIRBOX app settings menu. Because Airobot builds its systems around demand-controlled ventilation with integrated CO2 and humidity sensors, filter housings are compact and standardised across most residential AIRBOX generations — measuring the extract and supply filter dimensions in mm is the fastest way to confirm compatibility if the model label has worn off.

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.

Yes. Most of our filters are fully compatible with modern ventilation systems, including smart and automated units. However, we always recommend checking your system’s specifications or sending us your model details to ensure a perfect fit.