Having long been under review in various draft versions, the newly published revisions of ISO 14644 Parts 1 & 2 are now in full effect and supersede ISO 14644-1:1999 Classification of Air Cleanliness and ISO 14644-2:1999: Specifications for testing and monitoring to prove continued compliance with ISO 14644-1 respectively.
What has changed?
Apart from the title changes, the key points which both cleanroom owners, and cleanroom testing professionals need to be aware of are as follows:
- Method for determination of minimum sample locations: The square root method for determining the number of sample locations is now obsolete and replaced by fixed numbers for a given range of cleanroom floor areas, as defined in Table A.1 of ISO 14644-1:2015, when the area falls between the values in table A.1, the higher value is to be used. The test locations are to be spread evenly throughout the cleanroom zone. When a floor area is greater than 1000 sq.m, Equation A.1 is applied.
- UCL Calculations: The requirement for UCL Calculations (Upper confidence limit) is removed completely from the standard.
Impact of Cleanroom Owners & Cleanroom Professionals.
- Firmware: Particle Counting instruments must have their firmware upgraded to account for the above changes.
- Training & Documentation: Inhouse training, procedures and test documentation must be revised to account for the above changes.
Note: ISO 14644-1:2015 includes some further changes regarding Ultra and Micro (u,M) Descriptors and classification tables, details of which can be seen on the Lighthouse website, which provides a very informative overview of the change in standards, refer to the following link
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