According to ISO 14644-1:2015 cleanroom classification standard, 𝘙𝘦𝘲𝘶𝘪𝘳𝘦𝘥 𝘚𝘪𝘯𝘨𝘭𝘦 𝘚𝘢𝘮𝘱𝘭𝘦 𝘝𝘰𝘭𝘶𝘮𝘦 (VS) is the only formula (Formula A.2) that you should calculate as;
Where, Cn is the class limit for the largest considered particle
If you print the below table out, you don’t have to calculate every single cleanroom ISO class and designated particle sizes. This table could prove to be useful for cleanroom qualification and contamination control departments!
𝘗𝘭𝘦𝘢𝘴𝘦 𝘧𝘰𝘳𝘸𝘢𝘳𝘥 𝘵𝘩𝘪𝘴 𝘮𝘦𝘴𝘴𝘢𝘨𝘦 𝘵𝘰 𝘺𝘰𝘶𝘳 𝘤𝘰𝘭𝘭𝘦𝘢𝘨𝘶𝘦𝘴 𝘪𝘧 𝘺𝘰𝘶 𝘧𝘪𝘯𝘥 𝘪𝘵 𝘶𝘴𝘦𝘧𝘶𝘭!