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Extract filter size: 174x168x45 mmSupply filter size: 174x168x45 mmFilter class (EN779): M5+M5Filter quantity in a set: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Extract filter size: 174x168x45 mmSupply filter size: 174x168x45 mmFilter class (EN779): M5+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: 475x180x50 mmSupply filter size: 475x180x50 mmFilter class (EN779): G4+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: 275x187x20 mmSupply filter size: 275x187x20 mmFilter class (EN779): G4+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: 475x180x50 mmSupply filter size: 475x180x50 mmFilter class (EN779): G4+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: 174x168x45 mmSupply filter size: 174x168x45 mmFilter class (EN779): M5+M5Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Extract filter size: 275x187x20 mmSupply filter size: 275x187x20 mmFilter class (EN779): G4+G4Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Extract filter size: 275x187x20 mmSupply filter size: 275x187x20 mmFilter class (EN779): G4+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: 475x180x50 mmSupply filter size: 475x180x50 mmFilter class (EN779): G4+G4Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Extract filter size: 475x180x50 mmSupply filter size: 475x180x50 mmFilter class (EN779): G4+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
Extract filter size: - mmSupply filter size: 350x250x40 mmFilter class (EN779): G4Filter quantity in a set: 1 filterProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Extract filter size: 174x168x45 mmSupply filter size: 174x168x45 mmFilter class (EN779): M5+F7Filter quantity in a set: 2 filtersProtection levelFilter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Pollen and moldCaptures pollen, mold spores, and other allergens
Smog and bacteriaProtects against allergens and urban pollution
1-12 of 12Discover our range of replacement filters for your Paul ventilation unit, all made in the EU! Our selection includes high-performance filter sets available in G4 (ISO Coarse 70%), M5 (ISO Coarse 75% or ePM10 55%) or F7 (ISO ePM1 55%, 60% or 70%), designed to protect your system and improve indoor air quality. Whether you’re looking for original Paul filters or affordable house brand alternatives, all our options are quality-tested and fully compatible with Paul MVHR units.
Model compatibility
This category includes filter sets compatible with all major Paul MVHR ventilation units, including:
- Climos series
- Focus series
- ISO Defroster series
- Novus series
To ensure the right fit, it’s important to know the exact model of your ventilation unit, as different models require different filters. You’ll find helpful tips on identifying your device in the FAQ section.
Filter types and what they protect against
Our replacement filter sets for Paul units are designed to ensure optimal air quality and system performance through a combination of filters with different filtration roles. Available filter options:
- G4 filters (ISO Coarse 70%) on the extract and supply side: ideal for capturing larger particles like soil particles, large pollen grains, plant debris, insect wings, sawdust, sand and textile lint.
- M5 filters (ISO Coarse 75% or ePM10 55%) on the extract and supply side: ideal for capturing larger particles like pollen, mould spores, pet dander, and house dust.
- F7 filters (ISO ePM1 55%, 60% or 70%) on the supply side: high-efficiency filters that capture very fine particles, including bacteria, smog, tobacco smoke particles, combustion dust, spores, and wildfire smoke particles.
Usage and maintenance
To keep your MVHR system running efficiently and your indoor air clean, we recommend replacing the filters every 3–6 months. However, this depends on your environment, if you have pets, or nearby construction.
To make the process easy, we provide step-by-step replacement instructions for each filter model. You can find them under the “How to change” tab on every product page.
Manufacturing quality you can trust
The original filters are manufactured by Paul, a part of the Zehnder Group at Zehnder’s production facilities located in the Netherlands, France, and Switzerland. Our carefully developed house brand filters are also made in the European Union by certified manufacturers. Both are produced with high-quality materials, under strict ISO 16890 standards to ensure high filtration performance and reliability.
Customer Reviews
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.
What filter class is recommended for Paul units?


It depends on the model. The Paul filter sets we stock come in these combinations:
- Novus 300/450 and Focus 200 — G4+G4, or G4+F7 with a fine F7 (ePM1) supply filter
- Climos (F) 200 — M5+M5, or M5+F7
Because Passive House buildings get all their fresh air through the MVHR unit, the version with the F7 supply filter is usually the better choice for indoor air quality.
Why is Paul associated with Passive House ventilation specifically?


Paul Wärmerückgewinnung is a German pioneer of ventilation systems designed for Passive House and low-energy buildings, with several unit series built around very high heat-recovery efficiency. Depending on the model, Paul units use G4, M5 and F7 filters.
How do I identify my exact Paul model (e.g. Novus, Focus, Climos)?


Two pieces of information on the unit's front panel confirm your exact Paul model:
- The series name, such as Novus or Focus
- The longer alphanumeric model code, which specifies airflow capacity
Both help match you to the correct filter set, especially where multiple airflow variants share a series name.
How often should Paul filters be changed in a Passive House?


Check them every 3 months and replace them at least every 6 months. In a Passive House the MVHR unit supplies all the fresh air, so a clogged filter shows up quickly as stuffier air and more fan noise. Change the supply filter sooner during pollen season or if you live near a busy road, and keep a spare set at home so you never run the unit on saturated filters.
Do Paul Novus and Focus models use the same filter size?


No. The Focus 200 takes its own filter size, while the Novus 300 and Novus 450 share one set. The Climos (F) 200 uses a different size again. Check the series name and model number on the unit before ordering, then choose the G4+G4 or G4+F7 version (M5+M5 or M5+F7 for Climos).
Paul is a German manufacturer with Passive House certified units — do I have to use original Paul filters to keep that certification?


No. Certification by the Passivhaus Institut applies to the unit as it was tested — its heat recovery efficiency, electrical power and airtightness — not to the brand printed on the filter you fit years later. What matters for keeping the unit inside its tested operating range is that the replacement has the same filter class and the same dimensions, so the pressure drop and the air flow stay where the certification assumed they would be. A compatible F7/ePM1 filter of the correct size does that. Fitting a much denser filter than the unit was designed for is the change that could shift the operating point, whoever made it.
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