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Rational of planning,Rigorous of design

Clean Room (unidirectional flow)
Class 1 ~ 100 in clean room, are used Unidirectional airflow air flow, namely: clean indoor air at any point of the same section, the airflow direction and speed are consistent, so that you can make dust room air as "piston" as the interior of the dust particles to the fastest speed through the line filter removed.
To achieve the "piston" effect, high efficiency air filters typically require covered at the top cleanroom airflow direction can be achieved only one-way flow.