This question directly addresses the core components of clean workshop air purification systems. Its application value is mainly reflected in three scenarios.
1. Terminal air purification: Ensure the cleanliness of the core process area
This is its main application form, which directly determines the final cleanliness level of the production environment.
Installation location: It is usually used as the terminal supply air outlet of the clean room, such as the high-efficiency supply air outlet on the ceiling (HEPA is often integrated in the FFU, which stands for Fan Filter Unit, as well) or the side supply air outlet.
Core function: Filter the air that has been pre-treated by primary and medium-efficiency filters, with a particle retention efficiency of over 99.97% for particles ≥0.3μm, ensuring that the air sent into the core process area is clean.
Typical scenarios include photolithography areas in semiconductor chip manufacturing, aseptic filling areas in pharmaceutical production, and the protection of operating tables in biological laboratories.
2. Return air and exhaust air filtration: To prevent cross-contamination and environmental emissions
In addition to supplying air, the use of HEPA in return air or exhaust air systems is equally crucial, mainly for pollution control.
Return air filtration: It prevents particles generated in the clean room (such as production dust and dander) from returning to the air conditioning unit with the return air, contaminating other areas or blocking the heat exchanger, ensuring the cleanliness of the circulating air.
Exhaust filtration: When harmful or valuable particles (such as toxic dust, bioaerosols, and precious metal powders) are generated during the production process, HEPA filters can prevent these substances from being discharged outdoors, thereby avoiding environmental pollution and material loss.
3. Local environment enhancement: Create an ultra-clean micro-environment
In local areas with higher cleanliness requirements, HEPA is the key to building “clean islands”.
Application form: It is used in conjunction with local purification equipment such as clean benches, biosafety cabinets, and isolators.
Core function: Within these devices, an independent local space with a cleanliness level far higher than that of the surrounding environment is formed, providing absolutely clean protection for high-precision operations or high-risk experiments.
Typical scenarios: aseptic operation in microbiological testing, precise assembly of electronic components, and aseptic sampling in the pharmaceutical industry.
