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EN ISO 14644.1

CONTROLLED ROOM CLASSIFICATION STANDARDS

EN ISO 14644.1

Classes of air particle cleaning for clean rooms and protected areas

Classification No ISO CD 14644.1(1996)	Maximum admissiable concentration(particles per m³ of air)for particles of at least:
Classification No ISO CD 14644.1(1996)	0.1μm	0.2μm	0.3μm	0.5μm	1μm	5μm
ISO 1	10	2
ISO 2	100	24	10	4
ISO 3	1000	237	102	35	8
ISO 4	10000	2370	1020	352	83
ISO 5	100000	23700	10200	3520	832	29
ISO 6	1000000	237000	102000	35200	8320	293
ISO 7				352000	83200	2930
ISO 8				3520000	832000	29300
ISO 9				35200000	83200000	293000

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