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Definitions, procedures for evaluating performance, and major requirements of unidirectional flow clean-air devices will be detailed in IEST-RP-CC002.2, Unidirectional Flow Clean-air Devices. The new Recommended Practice (RP) was developed by Working Group-CC002 of the Contamination Control division of lEST to replace the 12-year-old document, IEST-RP-CC002-86, Laminar Flow Clean Air Devices.