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Extract filter size: 174x168x45 mmSupply filter size: 174x168x45 mmFilter class (EN779): M5+F7Filter 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
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: 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: 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
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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.
Since Passive House buildings rely entirely on MVHR for fresh air, is an H13 HEPA upgrade worth considering for a Paul unit?


Because Passive House buildings are airtight and depend on the MVHR system for essentially all fresh air exchange, filtration quality matters more than in a leakier property — an H13 HEPA-grade supply filter can meaningfully reduce fine particulate and allergen levels indoors. It's a common upgrade for allergy-sensitive households, though it's worth checking your Paul model's fan capacity first.
Do Paul Novus and Focus models use the same filter housing size, or does it vary by airflow capacity?


Filter housing size varies by airflow capacity within both the Novus and Focus series, so two units sharing a series name can still take different filter dimensions. The full alphanumeric model code — not just ‘Novus’ or ‘Focus’ — is what confirms the exact size for your unit.
How do I identify my exact Paul model (e.g. Novus, Focus)?


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.
What filter class is recommended for Paul units?


Paul units typically use an M5 filter for general dust and an F7 (ePM1) filter for fine particle and pollen filtration on the supply side, matching the airtight, well-sealed construction typical of Passive House buildings. Because these homes rely heavily on the MVHR system for all fresh air, keeping filters current is especially important 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. Filter selection follows the same M5/F7 logic as other MVHR brands, matched to your specific Paul model.
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