Cleanrooms are classified according to the number and size of particles permitted per volume of air. Large numbers like "class 100" or "class 1000" refer to FED-STD-209E, and denote the number of particles of size 0.5 ΞΌm or larger permitted per cubic foot of air.
International Organization for Standardization (ISO).
United States federal standard.
EU GMP classification.
British Standard.
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