HEPA (High efficiency particulate air filter) is a filter that meets HEPA standards. The characteristic of HEPA is that air can pass through, but small particles cannot pass through.

The simple process of LCD screen making is as follows: cleaning → printing orientation film → friction → sealing the printing layer and spreading spacer materials → combination → marking and cutting → LC injection → pasting polarizer → final screen making inspection.

The suspended pollution generated by personnel and processes can be immediately removed by this air, while the turbulent ventilation system adopts the principle of mixing and dilution. In an empty room without any obstacles, unidirectional flow can quickly remove pollutants with much lower wind speeds than previously mentioned. But in an operating room, the machine and the people walking around it can create obstacles to the airflow.