Classification of filters CEN EN 779 The CEN EN 779 stadards are based on the earlier Eurovent 4/5 and the Ashrae 52.76, where the in situ efficiency of the dust stain opacimeter and the gravimetric retention are determined by well-proven methods. The CEN classification is based on the old Eurovent specification, which divided filters into nine different types, EU-1 to EU-9 according to their medium opacimetric and gravimetric efficiencies. The CEN standards describe filters by means of letters and numbers: G-1, G-2, G-3 and G-4 for filters to sieve coarse dust F-5, F-6, F-7, F-8 and F-9 for filters to sieve fine dust Classification table according to the EN 779 standard for filters
Filter classification
Gravimetric efficiency Am (%)
Dust-Spot efficiency Em (%)
G-1
Am < 65
-
G-2
65 <= Am < 80
-
G-3
80 <= Am < 90
-
G-4
90 < Am
-
F-5
-
40 <= Em < 60
F-6
-
60 <= Em < 80
F-7
-
80 <= Em < 90
F-8
-
90 <= Em < 95
F-9
-
95 < Em
CEN EN 1882 For Hepa and Ulpa filters, the classification was based on the 4/4 Eurovent standard which defined 5 types of filters: EU-10, EU-11, EU-12, EU-13 y EU-14 In order to meet the requirements of high technology, new test methods and a new classification for absolute filters are needed. In Germany DIN launched the DIN 24183 standard project to test Hepa and Ulpa filters on the basis of the measurement of particles. CEN accepted as a basic test principle and classification system: EN 1822. The European standard EN 1822 replaces several domestic standards such as DIN 24184, BS 3928 and AFNOR 44013.
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