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Extract filter size: 459x207x31 mmSupply filter size: 459x207x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
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Extract filter size: 419x192x31 mmSupply filter size: 419x192x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 335x130x113 mmSupply filter size: 335x130x113 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 365x247x31 mmSupply filter size: 365x247x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 272x166x48 mmSupply filter size: 272x166x48 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 290x230x48 mmSupply filter size: 290x230x48 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 270x242x95 mmSupply filter size: 270x242x95 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 350x185x48 mmSupply filter size: 350x185x48 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 459x207x31 mmSupply filter size: 459x207x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 419x192x31 mmSupply filter size: 419x192x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 335x130x113 mmSupply filter size: 335x130x113 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 365x247x31 mmSupply filter size: 365x247x31 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 272x166x48 mmSupply filter size: 272x166x48 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
-
Extract filter size: 290x230x48 mmSupply filter size: 290x230x48 mmEfficiency (EN779): F7+F7Quantity: 2 filtersProtection level
Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.
BasicGeneral dust and particle filtration
Smog and BacteriaProtects against allergens and urban pollution
Flexit MVHR Filter Sets – Premium Air Filtration for a Healthier Home
Flexit MVHR (Mechanical Ventilation with Heat Recovery) filter sets are designed to maintain the efficiency of your ventilation system while ensuring clean and healthy indoor air. These filters effectively remove dust, allergens, and other airborne particles, providing a comfortable living environment.
Efficient Filtration for a Healthier Home
Our filter sets typically include combinations such as F7+F7 filters:
- F7 Filters – Provide fine filtration, effectively trapping smaller particles such as pollen, mold spores, and smog particles, ideal for supply and extract air. :contentReference[oaicite:8]{index=8}
This dual-filter setup ensures that your ventilation system operates efficiently, while maintaining high indoor air quality.
Compatible Flexit MVHR Models
Our filter sets are compatible with various Flexit MVHR models, including:
- Flexit UNI 2
- Flexit UNI 3
- Flexit UNI 4
- Flexit Nordic S2
- Flexit Nordic S3
- Flexit Nordic S4
- Flexit Nordic CL3
- Flexit K2.1
- Flexit S3X/K3X
- Flexit ProNordic S10R/S100R/S140R
- Flexit L14R
- Flexit C2
These filters are made in the EU, featuring moisture-proof cardboard frames, and comply with standards such as ISO 16890 and EN779:2012.
Recommended Replacement Schedule
To maintain optimal performance and air quality, it is recommended to replace your MVHR filters every 3 to 6 months, depending on environmental conditions and usage. Regular replacement helps:
- Maintain efficient airflow and system performance.
- Reduce energy consumption.
- Extend the lifespan of your ventilation system.
- Ensure a healthy indoor environment.
Fast Delivery & Quantity Discounts
We keep popular Flexit filter sets in stock, ensuring quick dispatch and delivery within 1–2 working days. Purchasing multiple sets? Enjoy automatic quantity-based discounts and earn loyalty points with every order.
Why Choose Our Flexit Filter Sets?
- High-quality filters compliant with international standards.
- Designed for compatibility with various Flexit MVHR units.
- Efficient filtration for both supply and extract air.
- Fast delivery and reliable customer service.
- Loyalty program and automatic multi-pack discounts.
Ensure your home stays fresh, healthy, and energy-efficient — upgrade your Flexit MVHR filters today.
Frequently Asked Questions
Frequently asked questions ordered by popularity.


Filter class refers to the size and amount of particles a filter can trap. The higher the classification, the more effectively the filter removes particles 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.




It is recommended to change the filters in your HRV every 3 to 6 months, depending on how dirty they become. However, the key signs that your filters need replacing include:
- An increase in noise from the HRV
- A reduction in the amount of air being supplied or extracted
Smart HRVs with an electronic control panel and display screen show the volume of air supplied and extracted per hour.
For example, if a Zehnder ComfoAir Q350 HRV in a 140m² home operates at an optimal rate of 190m³ per hour but drops to 150–170m³, the filters should be replaced.


Still Have Questions?
Support details to capture customers that might be on the fence.
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