Annex 1 has long referenced ISO 14644-1 for cleanroom classification. Despite this, there were several differences in the defined limits between the two documents. The update to Annex 1 in 2022 removed these differences to achieve complete alignment. The result of this is that Annex 1 compliant classification testing can be achieved by selecting the appropriate ISO Class when using legacy AeroTrak Portable Particle Counters.

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CC-132_Using-Legacy-AeroTrak-Portable-Particle-Counters-to-Classify-to-EU-GMP-Annex-1_A4_RevA (1).pdf