EN 779:2012 EN 779:2012 EN 1822:2009 ASHRAE-Standard 52.2-2007
Coarse Filters
Average Arrestance (Am)
Final Test Pressure Drop
250 [Pa]
Medium- and Fine Filters
Average Efficiency (Em)
and Minimum Efficiency(M.E.)
of 0.4 µm particles 
Final Test Pressure Drop
450 [Pa]
(H)EPA- and ULPA-Filters
Efficiency 
Minimum
Efficiency
Reporting
Value
(MERV)

50% ≤  Am < 65%
G1

   

 

MERV 1-4

65% ≤ Am < 80% 
G2

   

80% ≤ Am < 90%
G3


 

 

MERV 5

90% ≤ Am
G4


 

 

MERV 6-8

 
40% ≤ Em < 60%
M5
 

 

MERV 8-10

 

60% ≤ Em < 80%
M6

 

 

MERV 9-13

 

80% ≤ Em < 90%
M.E.: 35%
F7

 

 

MERV 13-14

 

90% ≤ Em < 95%
M.E.: 55%
F8

 

 

MERV 14-15

 

95% ≤ Em
M.E.: 70%
F9

 

 

MERV 16

 

 

Overall Value ≥ 85%
E10

 

MERV 16

 

Overall Value ≥ 95%
E11

 

MERV 16

 

Overall Value ≥ 99.5%
E12

 
 

Overall Value ≥ 99.95%
H13
Local Value ≥ 99.75%


 

Overall Value ≥ 99.995%
H14
Local Value ≥ 99.975%


 

Overall Value ≥ 99.9995%
U15
Local Value ≥ 99.9975%


 

Overall Value ≥ 99.99995%
U16
Local Value ≥ 99.99975%


 

Overall Value ≥ 99.999995%
U17
Local Value ≥ 99.9999%


Important Note!

The standards EN 779:2012 and EN 1822:2009 are built upon and matched on one another. But the test conditions of both standards differ to the test conditions of the ASHRAE standard 52.2-2007. So a comparison is just approximately possible.