In general, the last level of filter determines the degree of air purification, while the upstream levels of filters only serve a protective function. They protect the downstream filter to extend its service life, or protect the air conditioning system to ensure its normal operation.
The service life of the high-efficiency filter at the end of the clean room is more than 5 years, and the main factor affecting its service life is the quality of the pre filter.
When using the "G-F-H-U" efficiency specification classification, it is easy to estimate the efficiency of the required filters at each level. A filter can be set every 2-4 levels.
For example: G4 → F8 → H11 → H14, where the end H14 (high-efficiency) filter determines the cleanliness level of the air supply, H11 protects H14, F8 protects H11, G4 protects F8.
