| Efficiency specification | Recommended final resistance （Pa） |
| G3 (coarse effect) | 100～200 |
| G4 (junior secondary effect) | 150～250 |
| F5～F6 (medium effect) | 250～300 |
| F7～F8 (high school efficiency) | 300～400 |
| F9～H11 (sub-efficient) | 400～450 |
| Efficient and ultra efficient | 400～600 |
Average dust filtration efficiency by atmospheric dust colorimetry: 45%, 65%, 85%, 95%
Filtration efficiency rating: F5, F6, F7, F8
Mainly used for medium and high grade filtration, the filtered particles are between 5 particles – 10 microns