The new standard for air filtering at high speed
If you don’t have time to read all kinds of standards about air filters and still want to know what’s going on, we have something for you:
You can also simply read our short summary:
The brand new standard for air filters: ISO 16890
The quick overview for practitioners
A new standard for testing and classifying air filters will enter into force on 1 July 2018. This allows the performance of an air filter in real operation to be measured much more accurately.
We present you the new standard for air filters in fast passage.
EN 779 was great. Everybody knows F7 and G4, why a new standard?
Awareness of air pollution is increasing not only in public reporting, but also in the perception of the population. The exposure of the air to fine dust in particular is a topic that is critically pursued by the public, also from a health perspective.
The test procedure of the old standard EN 779 was only performed against a particle size of 0.4 µm. In reality, however, particulate matter is composed of a wide variety of particle sizes. Adapting the test procedure and the test dust to real operating conditions thus better reflects the real performance of a filter.
And how to test in the future?
The new standard now covers the ability of a filter to filter out or reduce various particle sizes from 0.3 µm to 10 µm: Exactly the particle area which represents a potential danger for the human organism and is called fine dust. The test procedure is therefore more realistic and says more about the actual performance of an air filter.
What are the names of the new filter classes according to ISO 16890?
Basically, there will be four classes of air filters in the future, for which a minimum requirement is defined and indicated on each air filter:
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0.3 µm to 10 µm
0.3 µm to 10 µm
0.3 µm to 2.5 µm
0.3 µm to 1 µm
How will the filters be called in the future?
Each filter tested according to ISO is identified with the filter class in which it still maintains the required efficiency of at least 50% compared to the particle mixture used. The separation efficiency compared to other filter classes can also be specified in the technical documentation of the filter.
Filter Name: ISO ePM10 70%
This code denotes a filter that has 70% separation efficiency compared to the test dust with particles between 0.3 µm and 10 µm. This would be a filter with a medium filter class. Performance refers to the second largest test dust (PM10). For finer test dust it apparently did not reach the necessary 50%.
Filter Name: ISO ePM1 75%
This code denotes a filter that has an average separation efficiency of 75% compared to test dust with particles between 0.3 µm and 1 µm. This would already be a fine dust filter. With ePM1, the performance refers to the finest test dust (PM1).
Is there a translation table for replacement filters between old and new filters?
Basically, a simple conversion of the old filter classes into the new ones is not possible, since the test procedures are not really comparable. However, we have compiled a table for all HTH pocket filters, from which you can see the values achieved according to ISO 16890:
Old EN 779
<ISO COARSE 90%
ISO ePM10 70%
ISO ePM2.5 55%
ISO ePM2.5 65%
ISO ePM1 75%
ISO ePM1 80%