CHICAGO, August 11, 2023 — The Institute of Environmental Sciences and Technology (IEST) announces new revisions to IEST-RP-CC0012.4: Considerations in Cleanroom Design.
This Recommended Practice (RP) makes recommendations regarding factors to consider in the design of cleanroom facilities. This discussion is limited to those environmental conditions that typically confront cleanroom designers and users. It is intended to provide users with factors to consider for cleanroom design. The specified ranges and recommended criteria are intended only to provide a framework.
Considerations in Cleanroom Design was prepared by Working Group 012 of the IEST Contamination Control Division (WG-CC012), led by Working Group Chair Wei Sun, owner of Engsysco, Inc.
What is Improved:
- Enhanced description about the “Integrity of Building Envelope and Interstitial Spaces to Prevent Insects/Pests Entry” in Section 4.3.12
- Improved description on “Process-specific airflow patterns”
- Revised language on “Wireless sensor”
- Detail discussions about dedicated space for storing cleaning equipment, water for cleaning and waste drain, etc. were added for the “Design considerations for controlling contamination” in Section 5.9.1
- Improved and more detail discussions on “Optimization of workflow/paths in existing cleanroom spaces,” “Design for facility disinfection” and “CFD” analysis
What is New:
- Discussion on “Impacts to building pressurization control”
- Detail diagrams for 4 categories of airlocks: Cascading, sink, bubble and dual-compartment
- Design considerations for cleanroom entry and exit for personnel
- Discussion section on “Room pressurization strategy”
- Detail discussion about grounding connections for wrist strap, footwear, work surfaces, metal walls and ceiling grids to avoid charging and ESD, impacts by RFI generator and ionizers, etc. were added in the “Grounding systems” in Section 5.16
- Discussion on “Airflow turn-down and reset” to reflect new ISO 14644-4 (2022) standard
- Discussion section for “Cleanroom enclosure airtightness”
- Discussion on “Demand based airflow control” to reflect ISO 14644-4 (2022)
- In the Appendix C of “Cleanroom Modeling Approach,” a new terminology called “contaminant removal effectiveness” was added to reflect the new 14644-4 (2022) and 14644-16 (2019) modeling equations, this correctional factor can increase the predictability in estimation and calculation airflow rate
- Discussion about ground filters, personnel grounding plan, ESD tester, etc. were added into the “Grounding systems” in Section 5.16
- References (articles, books and standards) were added in the Bibliography of Appendix E
A copy of IEST-RP-CC0012.4: Considerations in Cleanroom Design can be purchased through the IEST Bookstore. Contact Jennifer Sklena, Manager of Technical Programs, at 847-981-0100 or jsklena@iest.org.
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About IEST
Founded in 1953, Institute of Environmental Sciences and Technology (IEST) is a multidisciplinary, international society with members who are internationally recognized for their contributions to the environmental sciences in the areas of contamination control/cleanrooms, environmental test and reliability, or nanotechnology facilities. Our 501(c)(3) not-for-profit technical society is an ANSI-accredited standards-developing organization; Secretariat of ISO/TC 209 Cleanrooms and associated controlled environments; Administrator of the ANSI-accredited US TAG to ISO/TC 209; and a founding member of the ANSI-accredited US TAG to ISO/TC 229 Nanotechnologies.
