Air filters of various efficiency levels have specific functions, which determine their application and range of use.
Therefore, they will fully realize their functions if they are selected and used appropriately. The functions and effects of various air filters are as follows:
| Type | Function | Function |
| Primary Efficiency Filter | Removes dust particles >5μm. Initial resistance ≤50Pa. | Acts as a pre-filter in the air conditioning purification system to protect medium efficiency and high efficiency filters and other accessories in the air conditioning box to extend their service life |
| Medium-efficiency filters | remove dust particles ≥1.0µm with an initial resistance of ≤80Pa. | As an intermediate filter in the air conditioning purification system, it reduces the load of the high-efficiency filter and extends the service life of the high-efficiency filter and the accessories in the air conditioning box. |
| Sub-high efficiency filter | Remove dust particles ≥0.5um, initial resistance ≤120Pa | It can be used as an intermediate filter in the air conditioning purification system and as a terminal filter in the purification system. |
| HEPA filters | Remove dust particles ≥0.3um, initial resistance ≤220Pa | The terminal filter in the air conditioning purification system is a terminal purification device that must be used in clean rooms (0.3um clean rooms) |
| Ultra-high efficiency filter | Remove dust particles ≥0.1um, initial resistance ≤280 | The terminal filter in the air conditioning purification system is a terminal purification equipment that must be used in clean rooms (0.1um clean rooms). |
