A cleanroom is an environment typically used in different laboratories, where low level of environmental pollutants and a high level of sterility is required. It is a ‘contained space’ where arrangements are made to reduce the introduction, production, and storage of particles inside the room and to control other environmental factors such as temperature, humidity, and pressure.

Cleaning chambers are classified according to the air quality based on the value of 0.5 mm or larger particles per cubic feet or meters consistent with US Federal Standard 209. They are classified consistent with the amount and size of particles that are permitted per volume of air.

The US federal standards were officially cancelled in November 2001, with most switching to ISO-14644-1 and ISO 14698 standards that measure the number and size of particles that are permitted per cubic meter of air.

The following table compares the FS 209E vs ISO standards:

ISO 14644-1 FS 209E
3 1
4 10
5 100
6 1,000
7 10,000
8 100,000

Compared to the previous FS209E standards, the ISO standards has two ‘cleaner’ standards and one ‘dirtier’ standard.

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