his new European standard is based on particle counting methods that actually cover most needs for different applications. EN 1822:2009 differs from its previous edition (EN 1822:1998) by including the following:
An alternative method for leakage testing of Group H filters with shapes other than panels
An alternative test method for using a solid, instead of a liquid, test aerosol
A method for testing and classifying of filters made out of membrane-type media
A method for testing and classifying filters made out of synthetic fibre media
The main difference is related to the classification for the filter classes H10 - H12, which has now been changed to E10 - E12.
The following table shows the various classifications of high-efficiency filters per EN 1822: