Flexit Uni 4 Filters
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OriginalExtract filter size: 459x207x31 mmSupply filter size: 459x207x31 mmFilter class (EN779): F7+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
House brandExtract filter size: 459x207x31 mmSupply filter size: 459x207x31 mmFilter class (EN779): F7+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.
Which Flexit models (Nordic S2/S3, S4, CL, UNI and others) do you sell filters for?
We supply filter sets for Flexit's most widely used residential lines — Nordic S2/S3, S4 and CL2/CL3/CL4, UNI 2, UNI 3 and UNI 4, Econordic W4/WH4 and SL4R — common across Norway and the other Nordic countries. For Nordic and UNI units you can choose between Flexit originals and our house brand. The model designation is usually printed on the label on the front panel.
What filter class does Flexit use in its Nordic and UNI units?
Our house brand Flexit sets are F7+F7 — a fine F7 (ePM1) filter on both the supply and extract side — and the Econordic W4/WH4 and SL4R originals are F7+F7 as well. That protects the heat exchanger and gives strong filtration of fine dust and pollen in the incoming air.
Why do Flexit filters often need to be changed more frequently in winter?
Flexit heat exchangers are optimised to work in sub-zero temperatures, so during the cold season the unit often runs at a higher and steadier airflow to maintain heat recovery efficiency. Because of this more intensive operation, filters can fill up somewhat faster than in the warmer months, so it's worth doing an extra check in the middle of winter rather than waiting for your usual schedule. In Norwegian this is called “filterbytte” – filter changing – and the term is often mentioned in Flexit user manuals as well.
How do I replace the filter myself in a Flexit SL4R or similar model?
The filter compartment on Flexit MVHR units is reached by opening the front cover without any tools – usually loosening the latches or screws by hand is enough. Switch the unit off before opening the cover. After removing the old filter, check the airflow direction arrow on the new filter's frame and insert it in the same orientation. If you're unsure of the exact steps for your model (e.g. SL4R), follow that model's user manual, as the procedure can differ slightly between models.
Can I order Flexit filters in bulk for a homeowners’ association or several apartments?
Yes, we accept wholesale orders:
- for apartment building homeowners' associations
- for managers overseeing several buildings
- for landlords with multiple Flexit units
A larger discount per unit applies above a certain quantity. Send us the models of your units and the quantity needed – we'll prepare a consolidated order with enough filters for every MVHR unit in the building.
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