Table 4.8.
International standard ISO-29463-2011
| Efficiency (%) | Most penetrating particle size method (MPPS) | |
|---|---|---|
| 99.95 | ISO 35(H) | |
| 99.99 | ISO 40(H) | ISO 40(U) (leakage detection with scanning method is needed) |
| 99.995 | ISO 45(H) | ISO 45(U) (leakage detection with scanning method is needed) |
| 99.999 | ISO 50(U) (leakage detection with scanning method is needed) | |
| 99.9995 | ISO 55(U) (leakage detection with scanning method is needed) | |
| 99.9999 | ISO 60(U) (leakage detection with scanning method is needed) | |
| 99.99995 | ISO 65(U) (leakage detection with scanning method is needed) | |
| 99.99999 | ISO 70(U) (leakage detection with scanning method is needed) | |
| 99.999995 | ISO 75(U) (leakage detection with scanning method is needed) | |
Note: H and U represent HEPA filter and ULPA filter, respectively