【Reference】 The airflow pattern refers to the flow pattern and distribution form of the indoor air.

【Reference】 According to whether the indoor airflow has a single flow pattern or coexisting flow patterns, clean rooms can be divided into four categories:

(1) Unidirectional airflow clean room.

(2) Non-unidirectional airflow clean room.

(3) Radial airflow clean room.

(4) Mixed airflow clean room.

【Reference】 They are usually divided into unidirectional airflow clean rooms and mixed airflow clean rooms. The mixed airflow clean room is a colloquial term in the field of cleanroom technology, also known as the non-unidirectional airflow clean room.

【Reference】 A unidirectional airflow clean room is one in which airflow with parallel streamlines, a single direction, and uniform velocity flows through the working area of the room across the entire cross-sec cleanroom of the ... surface. Cleanrooms where the airflow is perpendicular to the floor are vertical unidirectional flow cleanrooms, and those where the airflow is parallel to the floor are horizontal unidirectional flow cleanrooms.

[Reference] Unidirectional flow is airflow that moves in a single direction with parallel streamlines and a uniform velocity across the cross-section. Any airflow that does not conform to the definition of unidirectional flow is called non-unidirectional flow.

[Reference] A radial flow cleanroom is one that uses semi-cylindrical or hemispherical radial-flow air supply outlets, supplying air from the upper part or the side and returning air at the lower part of the opposite side, so as to form radially directed airflow in the room.

[Reference] "Turbulent flow cleanroom" is a colloquial name; it vividly describes a cleanroom in which the airflow streamlines are not parallel, the direction is not uniform, and the velocity is uneven, with turbulent airflow that crosses and swirls flowing through the entire cross-section of the room's working area.