International classification of air filters

New international classification of air filters
according to ČSN EN ISO 16890

Class designation Requirement Specified value for the class
ePM1, min ePM2,5, min ePM10
ISO COARSE – - ≥ 50 % Initial gravimetric separability
ISO ePM10 – – ≥ 50 % ePM10
ISO ePM2,5 – ≥ 50 % – ePM2,5
ISO ePM1 ≥ 50 % – – ePM1

Classification of air filters
according to CSN EN 1822:2010

EN 1822 Total value for MPPS particles (0.1 – 0.3 μm) Integral value for MPPS particles (0.1 – 0.3 μm)
Filter group Filtration class Efficiency (%) Penetration (%) Efficiency (%) Penetration (%)
Group E EPA E 10 ≥ 85 ≤ 15 – -
E 11 ≥ 95 ≤ 5 – –
E 12 ≥ 99,5 ≤ 0,5 – –
Group H HEPA H 13 ≥ 99,95 ≤ 0,05 ≥ 99,75 ≤ 0,25
H 14 ≥ 99,995 ≤ 0,005 ≥ 99,975 ≤ 0,025
Group U ULPA U 15 ≥ 99,9995 ≤ 0,0005 ≥ 99,9975 ≤ 0,002 5
U 16 ≥ 99,999 95 ≤ 0,000 05 ≥ 99,999 75 ≤ 0,000 25
U 17 ≥ 99,999 995 ≤ 0,000 005 ≥ 99,999 9 ≤ 0,0001

Previous international classification of air filters
according to ČSN EN 779:2012 and ČSN EN 1822:2010

EN 779   Moderate separation efficiency (Am) of synthetic dust (%)   Filter efficiency (Em) for 0.4 μm particles (%) Minimum efficiency (M.E. for 0.4 μm particles (%))
Filter group Filtration class
Coarse dust G1 50 < Am < 65 – –
G2 65 < Am < 80 – –
G3 80 < Am < 90 – –
G4 90 < Am – –
  Semi-coarse dust M5 – 40 < Еm < 60 –
M6 – 60 < Em < 80 –
  Fine dust F7 – 80 < Em < 90 35
F8 – 90 < Em < 95 55
F9 – 95 < Em 70



EN 1822 Total value for MPPS particles (0.1–0.3 μm) Integral value for MPPS particles (0.1–0.3 μm)
Filter group Filter class Efficiency (%) Penetration (%) Efficiency (%) Penetration (%)
  Group E
EPA		 E 10 ≥ 85 ≤ 15 – –
E 11 ≥ 95 ≤ 5 – –
E 12 ≥ 99.5 ≤ 0.5 – –
  Group H
HEPA		 H13 ≥ 99.95 ≤ 0.05 ≥ 99.75 ≤ 0.25
H 14 ≥ 99.995 ≤ 0.005 ≥ 99.975 ≤ 0.025
  Group U
ULPA		 U 15 ≥ 99.999 5 ≤ 0.000 5 ≥ 99.997 5 ≤ 0.002 5
U 16 ≥ 99.999 95 ≤ 0.000 05 ≥ 99.999 75 ≤ 0.000 25
U 17 ≥ 99.999 995 ≤ 0.000 005 ≥ 99.999 9 ≤ 0.0001