International Standard 14644-1UPDATE

International Standard 14644-1UPDATE

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

Lighthouse ISO14644 Overview

Please contact CES here , should you require any further information or assistance surrounding the above subject matter.

By |2018-11-13T23:22:40+00:00June 9th, 2016|Industry News|0 Comments

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