ISO standards

ISO standarder

ISO standards

At Danfilter, we test and document our products - this is, of course, done in accordance with current industry standards.

ISO 16890 was introduced in 2017-2018 and replaced the previous European standard EN779: 2012. All filter classes were given new names according to the ISO standard, but the old ones will remain in our vocabulary for many years to come - you will, therefore, find both the old and new names at Danfilter.

With ISO 16890 a new method for testing and documentation of filters was introduced. Previously, all filters were tested with particles of the same size. A particle count before and after filtering determined the efficiency of the filter. ISO 16890 allows us to test filters with three different particle sizes.

These are:

  • 10 um
  • 2,5 um
  • 1,0 um

This is why ISO 16890 filter classes are named after the particle size followed by a percentage. A filter can now e.g. be called ePM 2.5 65%, to show its class and size. The same filter tested with a different particle size could thus also be called ePM 1.0 55%

In order to make conversion from EN 779 to ISO 16890 easier, we have created the following table:

G3 > 80 %
G4 > 90 %
M5 > 50 %
M6 50-65 % > 60 %
F7 50-65 % 65-80 % > 85 %
F8 65-80 % > 80 % > 90 %
F9 > 80 % > 95 % > 95 %  


ISO 16890 & EN77

EN779 will not expire, but is replaced by ISO16890 in our product range. There will still be filters on the market that are not necessarily ISO approved, and many will have two parallel assortments.

There may be several good reasons for this. Particularly older ventilation systems and process ventilation will not necessarily need anything but their filters changed to some that are identical to those being replaced. So, the filtering need is the same.

ISO does not cost extra when you shop with us. It is our responsibility to test and document our products. Danfilter's in-house production has been adjusted, so that we comply with the applicable requirements and our suppliers have been producing according to the ISO norm for a long time - but we might not have talked about this enough.

It is important to us that we always offer quality and tested products to our customers. Danfilter has ensured a continuous transition to ISO 16890 - thus new products that become available at our warehouse are always of the latest standard.


Contact our customer service

At Danfilter, we ensure that all filters are clearly labelled with both EN779 and ISO 16890, making the transition easier for both customers and us.
If you have any questions about our specifications or filter standards, please feel free to contact our team for technical advice and service who are always ready to help.

Customer Service & Sales

+45 4919 2266

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