EN1822:2009
European Standard for EPA, HEPA & ULPA Filters
Procedure
- On a flat sheet of media, the MPPS is determined for the given media velocity. This can be done with a laser spectrometer or a combination of electrostatic classifier and CNC (Condensed Nucleus Counter).
- The filter is assembled with the specified media grade and amount of media to comply with the defined media velocity.
- The filter is challenged with an aerosol and at the MPPS both the local and overall efficiency are determined with either a CNC or laser spectrometer.
- Leaks are specified as maximum allowable local penetration at the MPPS and must not exceed 5 x the overall penetration.
- The filter is classified according to the test results in the range E10 - E12 for EPA (Efficiency Particulate Air Filters), H13 - H14 for HEPA (High Efficiency Particulate Air Filters), U15 - U17 for ULPA (Ultra Low Penetration Air Filters).
| Filter Classification |
Efficiency (%) at the MPPS | Penetration (%) at the MPPS | ||
| Overall Value | Local Value | Overall Value | Local Value | |
| E10 | > 85 | - | 15 | - |
| E11 | > 95 | - | 5 | - |
| E12 | > 99,5 | - | 0,5 | - |
| H13 | > 99,95 | 99,75 | 0,05 | 0,25 |
| H14 | > 99,995 | 99,975 | 0,005 | 0,025 |
| U15 | > 99,9995 | 99,9975 | 0,0005 | 0,0025 |
| U16 | > 99,99995 | 99,99975 | 0,00005 | 0,00025 |
| U17 | > 99,999995 | 99,9999 | 0,000005 | 0,00001 |
Notes:
• Filters in the class E10, E11 and E12 do not require verification of local penetration.
• Filters in the classification H13 and H14 may, as an alternative, be verified with the visual oil-smoke oil thread test (previously known as DIN 24.184), which is accepted as equal or more searching than the specified local penetration.
• U17 is an exception to the rule. In this case local penetration may not exceed 20 x the overall penetration value.
