What is the purification principle of the clean room purification project?

Purification principle
 Airflow → primary effect air treatment → air conditioning → intermediate effect air treatment → fan pressurized air supply → purified air supply duct → efficient air supply opening → clean room → take away dust (bacteria) → return air duct → fresh air, primary air treatment .
Repeat the above process to achieve the purpose of purification.
Technical Parameters
Ventilation frequency: 10-15 times per hour for one hundred thousand level;
15-25 times per hour for 10,000 level;
Thousand levels 50-52 times / hour;
The cross-section wind speed of the 100-level console is 0.25-0.35m / s;
Differential pressure: ≥5Pa for adjacent clean room in main workshop; ≥10Pa for clean room to non-clean area
Temperature: Winter> 16 ℃ ± 2 ℃; Summer <26 ℃ ± 2 ℃;
Relative humidity: 45-65% (RH);
Noise ≤65dB (A);
Fresh air supply: 20% -30% of the total supply air volume;
Illumination: ≥300Lux.
Structural materials
1. The clean room wall and roof materials are generally made of 50mm thick sandwich color steel plates and alumina profiles for purification. The door adopts purification and closed door, and the window adopts aluminum alloy glass fixed window.
2. The ground adopts epoxy self-leveling or high-grade wear-resistant plastic clean floor.
3. Purification and ventilation pipes are made of galvanized thin steel plate, and use "PEF" flame retardant insulation board for insulation.