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to main contents pageData processing sites should comply with the specifications of "CLASS 4,000,000" of the NF X44-101 classification standard dated June 1981: definition and classification of the specific cleanliness of air and other gases.
No. of solid particles per m3 of air Diameter of particles 4,000,000 0.5 µm 25,000 5 µm
For more information, see Cleaning.