1、 Classification of filtration grade of air filter
Chinese national standard grade: primary efficiency filter, medium efficiency filter, high and medium efficiency filter, sub high efficiency filter and high efficiency filter.
Corresponding European standard grades: (initial effect) G1, G2, G3, (medium effect) G4, F5, high effect (F6, F7, F8, F9), (sub high efficiency) H10, H11, (high efficiency) H12, H13, h14
| Filter grade | Corresponding to American Standard | Filtering accuracy | Filtration efficiency |
| G1（EN779） | C1 | ≥5μm | 40% |
| G2（EN779） | C2-C4 | ≥5μm | 70% |
| G3（EN779） | L5 | ≥5μm | 85% |
| G4（EN779） | L6 | ≥5μm | 90% |
| F5（EN779） | M9、M10 | 1-10μm | 35% |
| F6（EN779） | M11、M12 | 1-10μm | 45% |
| F7（EN779） | H13 | 1-10μm | 65% |
| F8（EN779） | H14 | 1-10μm | 85% |
| F9（EN779） | H15 | 1-10μm | 95% |
| H10(EN18822) | H15 | ≥0.3μm | 90% |
| H11(EN18822) | H16 | ≥0.3μm | 99% |
| H12(EN18822) | H16 | ≥0.3μm | 99.9% |
| H13(EN18822) | H17 | ≥0.3μm | 99.99% |
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