ISO Revises Cleanroom Standard on Performance Test Methods

The latest cleanroom test methods are highlighted in the newly issued ISO Draft International Standard (DIS) 14644 Cleanrooms and associated controlled environments — Part 3: Test methods. This update of the 2005 Standard has been modified to align with the recent landmark revisions of 14644 Part 1: Classification of air cleanliness by particle concentration and Part 2: Monitoring to provide evidence of cleanroom performance related to air cleanliness by particle concentration.

ISO/DIS 14644-3 sets out appropriate test methods for measuring the performance of an installation, a cleanroom, or an associated controlled environment. This new document, along with all of the ISO 14644 Cleanroom Standards, is available from IEST, the Secretariat to ISO Technical Committee 209 (ISO/TC 209).

Daniel Dennison, manager of Precision Air Technology and the longtime US expert to Working Group 3 of ISO/TC 209, points to several noteworthy changes in the document:

Intended for use by certifying companies and end users alike, ISO/DIS 14644-3 specifies performance tests for two types of cleanrooms (unidirectional and non-unidirectional) in three occupancy states (as-built, at-rest, and operational). Principles, selection guidelines, procedures, and required apparatus are outlined for the following tests:

This is the public’s first look at the revised test methods of the ISO 14644 series following the revision of Parts 1 and 2. ISO/DIS 14644-3 is being reviewed globally by ISO/TC 209 national member bodies during the three-month Draft International Standard ballot. Visit to be one of the first to review this new document.  In the US, technical experts should provide feedback by February 10, 2017 to IEST as the Administrator to the United States Technical Advisory Group (US TAG) to ISO/TC 209.

Training on the Revised Standard
To advance knowledge of the revisions, IEST offers the ISO 14644 Fundamentals Certificate thought its Learning Path Contamination Control Certificate program. Courses are scheduled in Pasadena, Texas from February 28–March 2, 2017.

The ISO 14644 certificate series includes a full-day Application of ISO 14644-3 training course with an in-depth examination of test methods for characterizing the performance of cleanrooms. The course explores the practical application of the standard in certifying a clean space. An open forum will provide opportunities to discuss how to implement the standards, the revisions, what may or may not work in different types of cleanroom environments, and primary equipment.

Registration for this course is now open on the IEST website and will include a copy of ISO/DIS 14644-3. The ISO 14644 Fundamentals Certificate also includes training on ISO 14644-1 and -2, as well as ISO 14644-5, which addresses cleanroom operations.