About the filter efficiency classes specified in EN1822
Filter cartridges can be divided into three grades: E-grade, H-grade, and U-grade, based on their performance (mainly efficiency and penetration rate). The filter efficiency grade can be classified as follows, based on the MPPS efficiency and penetration rate of the filter cartridge, and the efficiency and penetration rate of the filter in a non-electrostatic state:
| Filter Efficiency Grade | Overall Value | Local Value | ||
| Efficiency ( % ) | Penetration Rate ( % ) | Efficiency ( % ) | Penetration Rate ( % ) | |
| E10 | ≥85 | ≤15 | / | / |
| E11 | ≥95 | ≤5 | / | / |
| E12 | ≥99.5 | ≤0.5 | / | / |
| H13 | ≥99.95 | ≤0.05 | ≥99.75 | ≤0.25 |
| H14 | ≥99.995 | ≤0.005 | ≥99.975 | ≤0.025 |
| U15 | ≥99.9995 | ≤0.0005 | ≥99.9975 | ≤0.0025 |
| U16 | ≥99.99995 | ≤0.00005 | ≥99.99975 | ≤0.00025 |
| U17 | ≥99.999995 | ≤0.000005 | ≥99.9999 | ≤0.0001 |
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