Clean Room Classification
Correlation between particle size efficiency, Eurovent 4/5,EN779 and ASHRAE 52.1 and 52.2 Ratings
| Eurovent 4/5 | EU3 | EU4 | EU5 | EU6 | EU7 | EU8 | EU9 |
| EN 779 | G3 | G4 | F5 | F6 | F7 | F8 | F9 |
| Arrestance | 60 to 80% | 80 to 90% | 90 to 95% | 95 to 98% | >98% | >98% | >98% |
| Dust spot efficiency | < 20% | 20 to 35% | 40 to 55% | 60 to 80% | 80 to 90% | 90 to 95% | >95% |
| MERV | 5,6 | 7,8 | 9,10 | 11,12 | 13 | 14 | 15 |
| % Min. PSE @ 10 micron | 90 | 98 | 100 | 100 | 100 | 100 | 100 |
| % Min. PSE @ 5 micron | 75 | 80 | 95 | 98 | 100 | 100 | 100 |
| % Min. PSE @ 3 micron | NA | NA | 85 | 90 | 95 | 98 | 100 |
| % Min. PSE @ 1 micron | NA | NA | 55 | 70 | 85 | 90 | 95 |
| % Min. PSE @ 0.5 micron | NA | NA | 35 | 50 | 65 | 75 | 85 |
| % Min. PSE @ 0.3 micron | NA | NA | 20 | 40 | 50 | 60 | 70 |
Rating Comparison for HEPA and ULPA Filters
| EN 1822 FILTER CLASS | % MPPS EFFICIENCY | EFFICIENCY AS PER IEST-RP-CC-034.1 |
| H 10 | 85 | 95% @ 0.3 microns |
| H 11 | 95 | 99.9% @ 0.3 microns |
| H 12 | 99.5 | 99.97% @ 0.3 microns |
| H 13 | 99.95 | 99.99% @ 0.3 microns |
| H 14 | 99.995 | 99.999% @ 0.3 microns |
| U 15 | 99.9995 | 99.9975% @ 0.12 microns |
| U 16 | 99.99995 | 99.99975% @ 0.12 microns |
| U 17 | 99.999995 | 99.999975% @ 0.12 microns |
