Unidirectional flow clean room are generally of two types, namely horizontal flow and vertical flow. In a horizontal flow system, the flow of air flows from one wall to another. In a vertical flow system, the flow of air flows from the ceiling to the ground. Unidirectional airflow is used on occasions where the concentration of suspended particles in the clean room is required or the concentration of microbes is lower. This kind of clean room was formerly known as a "laminar" clean room.
The name of unidirectional flow and laminar flow in air purification engineering indicates the status of its airflow: airflow flows in one direction (or vertical or horizontal), and flows through the whole space at a speed of 0.3 M / sec to 0.5 m / sec. The HEPA filter with clean room ceiling to indoor air. The air flow is like an air piston, flowing down the room, taking the pollutants away, and discharging it from the ground. After mixing with some fresh air from the outside, it is recirculated to the high efficiency filter.
The suspension pollution produced by the air purification engineering process can be removed immediately by this air, while the turbulence ventilation system uses the principle of mixing and dilution. In an empty room with no obstacles, a one-way flow can quickly remove the pollutants with a much lower wind speed than it mentioned earlier.
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