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Particle Counters keep in mind 3

GMP Annex 1 current version (2008) and ISO 14644 Part 1 2015 revision have tables to define particle limits for Classes (ISO) and Grades (GMP) for considered particle size. ISO also defines sample locations based on the cleanroom area and GMP also applies the same Table A1 to define number of locations.

𝘗𝘳𝘪𝘯𝘵 𝘵𝘩𝘪𝘴 𝘣𝘦𝘭𝘰𝘸 𝘵𝘢𝘣𝘭𝘦 𝘰𝘶𝘵 𝘢𝘯𝘥 𝘬𝘦𝘦𝘱 𝘪𝘵 𝘢𝘴 𝘢 𝘲𝘶𝘪𝘤𝘬 𝘳𝘦𝘧𝘦𝘳𝘦𝘯𝘤𝘦.

ISO 146444 Part 1 and GMP Annex1 Particle Classification Tables