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Measuring the airflow speed is crucial, particularly for unidirectional (laminar) flow cleanrooms, to ensure appropriate air change rates and sweep contaminants away from the work zone. D. Airflow Volume
edition (and its 2020 corrections) brought several key changes:
This article provides a comprehensive overview of the ISO 14644-3 standard, its key changes from the 2005 edition, and how it is applied to verify cleanliness. 1. What is ISO 14644-3:2019?
This test is essential for ensuring that the HEPA/ULPA filters and their frames are properly sealed. The standard outlines the use of an aerosol photometer to detect leaks, using an aerosol challenge (e.g., PAO) upstream. C. Airflow Velocity and Uniformity
A key feature of ISO 14644-3:2019 is its detailed annexes, which provide practical, step-by-step guidance for performing complex tests. These annexes are normative (required) and are essential for proper implementation.
, which replaced the 2005 version. While there isn't a "2021" edition of part 3 specifically, ISO 14644-1:2015
Measures the air velocity of unidirectional airflow or the airflow volume of non-unidirectional airflow. Purpose: Ensures air exchange rates are maintained. B. Installed Filter System Leakage Test
The first part of the standard (ISO 14644-1:2021) provides an overview of the cleanroom concept, basic principles, and requirements for cleanrooms and associated controlled environments. This part of the standard:
The room is challenged with 100 times its target particle concentration, and the time to recover is recorded.
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