Cleanrooms are classified according to the number and size of particles allowed to be present in air within the cleanroom. There are four standards used in the classification of cleanrooms, listed below;
- Federal Standard 209E
- ISO Standard
- British Standard 5295
- Pharmaceutical Cleanroom Classification
The Federal Standard 209E was revoked in 2001 by the US Dept. of Commerce General Services Administration, however the standard is widely used by the industry.
