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  • Flexit Uni 4 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 459x207x31 mm
    Supply filter size: 459x207x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    26,90 26,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 66 points
  • Flexit Uni 3 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 419x192x31 mm
    Supply filter size: 419x192x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    25,89 25,89 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 63 points
  • Flexit Uni 2 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 335x130x113 mm
    Supply filter size: 335x130x113 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    28,89 28,89 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 69 points
  • Flexit Nordic S4 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 365x247x31 mm
    Supply filter size: 365x247x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    25,89 25,89 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 63 points
  • Flexit Nordic S2/S3 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 272x166x48 mm
    Supply filter size: 272x166x48 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    23,90 23,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 57 points
  • Flexit Nordic CL2/CL3/CL4 filter set F7+F7 (house brand)
    House brand
    (0)
    Extract filter size: 290x230x48 mm
    Supply filter size: 290x230x48 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    24,90 24,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 60 points
  • Flexit Econordic W4/WH4 filter set F7+F7 (original)
    Original
    (0)
    Extract filter size: 270x242x95 mm
    Supply filter size: 270x242x95 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    69,90 69,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 171 points
  • Flexit SL4R filter set F7+F7 (original)
    Original
    (0)
    Extract filter size: 350x185x48 mm
    Supply filter size: 350x185x48 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    53,91 53,91 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 132 points
  • Flexit Uni 4 filter set (original)
    Original
    (0)
    Extract filter size: 459x207x31 mm
    Supply filter size: 459x207x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    73,89 73,89 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 183 points
  • Flexit Uni 3 filter set (original)
    Original
    (0)
    Extract filter size: 419x192x31 mm
    Supply filter size: 419x192x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    57,90 57,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 141 points
  • Flexit Uni 2 filter set (original)
    Original
    (0)
    Extract filter size: 335x130x113 mm
    Supply filter size: 335x130x113 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    89,90 89,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 222 points
  • Flexit Nordic S4 filter set (original)
    Original
    (0)
    Extract filter size: 365x247x31 mm
    Supply filter size: 365x247x31 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    64,90 64,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 159 points
  • Flexit Nordic S2/S3 filter set (original)
    Original
    (0)
    Extract filter size: 272x166x48 mm
    Supply filter size: 272x166x48 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    59,90 59,90 

    Price for set

    Shipping: within 24 hours
    1
    Cashback reward  - 
    Earn 147 points
  • Flexit Nordic CL2/CL3/CL4 filter set (original)
    Original
    (0)
    Extract filter size: 290x230x48 mm
    Supply filter size: 290x230x48 mm
    Efficiency (EN779): F7+F7
    Quantity: 2 filters
    Protection level

    Filter protection level indicates efficiency in blocking particles or contaminants, varying by standard and application.

    Basic

    General dust and particle filtration

    Smog and Bacteria

    Protects against allergens and urban pollution

    57,90 57,90 

    Price for set

    Shipping: Wihitn 24 hours
    1
    Cashback reward  - 
    Earn 141 points
1-14 of 14

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.

What is the difference between G4, M5, F7, etc. class filters? Plus icon Close icon

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.

How often do I need to change the filters in my HRV? Plus icon Close icon
It is recommended to change the filters in your MVHR 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 MVHR
- A reduction in the amount of air being supplied or extracted
Smart MVHRs 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 MVHR in a 140m² home operates at an optimal rate of 190m³ per hour but drops to 150–170m³, the filters should be replaced.
How do I change the filter on my recuperator? Plus icon Close icon

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.

How do I find the model name and number of my recuperator? Plus icon Close icon
There are several ways to identify the manufacturer and model of your recuperator:
1. Check the label on the unit itself, which usually displays the manufacturer and model number.
2. Contact your installer or the developer/builder of your property for details.
3. Measure the width, length, and height of the filter, then use these measurements to browse our online shop. Our system will suggest the correct recuperator filters for your unit.
4. If none of the above help, please get in touch via the chat box at the bottom right of the page, and we’ll be happy to assist you.

Still Have Questions?

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

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