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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Type according to
Integral* efficiency for MPPS
EN 1882
DIN 24183
DIN 24184
BS 3928
Mil. Std. 292
>= 85%
H-10
EU-10
Q
EU-10
-
>= 95%
H-11
EU-11
R
EU-11
>= 95%
>= 99,5%
H-12
EU-12
-
EU-12
>= 99,97%
>= 99,95%
H-13
EU-13
S
EU-13
>= 99,99%
>= 99,995%
H-14
EU-14
-
EU-14
>= 99,999%
>= 99,9995%
U-15
EU-15
-
-
>= 99,99995%
U-16
EU-16
-
-
>= 99,999995%
U-17
EU-17
-
-
* The integral efficiency is the average value of all the local efficiencies on the front area of the filter.
In the first stage of this EN 1822 standard the fractional efficiency will be assessed for the plain filtration measures at the same speed as in the filter. The purpose is to define the size of particles where the average offers the lowest retention efficiency, referred to as Major Particle Penetration Size.
The particle size is normally between 0.15 and 0.25 Âľm. The next step is to determine the collection efficiency of the filter for this MPPS. They are classified into two groups according to efficiency, leaks and porosity: Hepa (High Efficiency Particular Air) filters: H-10, H-11, H-12, H-13 and H-14. ULPA filters (Ultra Low Penetration Air):
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CEN EN 1822 standard Filter group
INTEGRAL MPPS VALUE
LOCAL MPPS VALUE
Filter type
Efficiency %
Penetration %
Local efficiency %
Penetration %
H-10
85
15
-
-
H-11
95
5
-
-
H-12
99,5
0.5
97,5
2.5
H-13
99,95
0.05
99,75
0.25
H-14
99,995
0.005
99,975
0.025
U-15
99,9995
0.0005
99,9975
0.0025
U-16
99,99995
0.00005
99,99975
0.00025
U-17
99,999995
0.000005
99,9999
0.0001
HEPA (H)
ULPA (U)
The process for measuring efficiency is by means of scanning. The leakage test is individual.
Equivalency of standards Gravimetric EU2 Coarse filters
G2 <= 65%
MERV 1-4
EU3
G3 <= 80%
MERV 5
EU4
G4 <= 90%
MERV6-7
Opacimetric
Fine filters
EU5
F5 <=40%
MERV 5-8
EU6
F6 <= 60%
MERV 10-11
EU7
F7 <= 80%
MERV 12-13
EU8
F8 <= 90%
MERV 13-14
EU9
F9 <= 95%
MERV 14-15
DOP 0,3 Âľm
HEPA
ULPA
MPPS
EU10
<= 95%
H10 <=85%
MERV 16
EU11
<= 99,9%
H11<=95%
MERV 16
EU12
<= 99,97%
H12 <=99,5%
MERV 17
EU13
<= 99,99%
H13 <=99.95%
MERV 18
EU14
<=99,999%
H14 <=99,995%
MERV 19
U15 <=99,9995%
MERV 20
U16 <=99,99995% U17 <=99,999995%
Filter-Technics bvba - Van Roeyenstraat 28, B-2070 Zwijndrecht, Tel +32-(0)3.254.05.67 fax +32-(0)3254.04.95 info@filter-technics.be