HEPA is an abbreviation for high-efficiency particulate air and stands for air filters that block at least 85% of all dust particles of 0.3 micrometers (µm). Incidentally, particles smaller than 0.3 µm are also captured better than the indicated percentage, but that is a very technical story. It is important to know that there are different classes of HEPA filters.
The HEPA filter classes are specified in European Standard 1822: 2009 of the European Union.
|HEPA class||Retention (total)|
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