The table below shows the different classifications of cleanroom filters.

Highlighted with a red circle are the filters used by Clean Environments

Filter application Particulate air flters for general ventilation EPA, HEPA and ULPA
Test EN 779:2012 evaluation of flter performance at 0,944 m³/s (or nominal fow) EN 1822:2011 (Part 1 to 5) Evaluation of flter performance by nominal fow

Suitable for

Group designation

Filter classes

Test dust / aerosol

Final pressure drop in Pa

Average arrestance (Am)
compared with test dust in %

Average ef ciency (Em) for
particles of 0.4 microns in %

Minimum ef ciency for
particles 0.4 microns in %

Previous: DIN EN 779:2003
(Predecessor: DIN 24185)

Filter classes

Test dust

Integral value of separation
in the MPPS in %

Integral value of transmittance
in the MPPS in %

Local value of separation
in the MPPS in %

Local value of transmittance
in the MPPS in %

Previous: DIN EN 1822:1998
(Predecessor DIN 24184)

Coarse dust

G G1 ASHRAE dust (72 % fne test dust ISO 12103-1:1997 A2 23% carbon black and 5% cotton linters) 250 50 ≤ Am 65 G1              
G2 250 65 ≤ Am 80 G2
G3 250 80 ≤ Am 90 G3
G4 250 90 ≤ Am

G4

Fine dust

M M5 DEHS (Di-Ethyl-Hexyl- Sebacate) 0.2–3.0 μm 450 40 ≤ Em 60 F5              
M6 450 60 ≤ Em 80 F6
F F7 450 80 ≤ Em 90 35 F7
F8 450 90 ≤ Em 95 55 F8
F9 450 95 ≤ Em 75 F9

Suspended dust

E EPA: Ef cient Particulate Air flter E10 DEHS (Di-Ethyl-Hexyl-Sebacate) MPPS 0.1–0.3 μm ≥ 85 ≤ 15 H 10
E11 ≥ 95 ≤ 5 H11
E12 ≥ 99.5 ≤ 0.5 H12
H HEPA: High Ef ciency Particulate Air flter H13 ≥ 99.95 ≤ 0.05 ≥ 99.75 ≤ 0.25 H13

H14

≥ 99.995 ≤ 0.005 ≥ 99.975 ≤ 0.025 H14
U ULPA: Ultra Low Penetration Air flter U25 ≥ 99.9995 ≤ 0.0005 ≥ 99.9975 ≤ 0.0025 U15
U26 ≥ 99.99995 ≤ 0.00005 ≥ 99.99975 ≤ 0.00025 U16
U27 ≥ 99.999995 ≤ 0.000005 ≥ 99.9999 ≤ 0.0001 U17