How are clean rooms classified?
Brigham Young University Examines the different Cleanroom Classifications:
Two standards are used to classify cleanrooms. The first, Federal Standard 209E, is used domestically and the newer standard is TC 209 from the International Standards Organization. Both standards classify a cleanroom by the number of particles found in the laboratory’s air. Since the BYU IML lab is a class 10 cleanroom by the Federal Standards, there are less than 10 particles per cubic foot. The following chart compares the Federal Standard to ISO classifications: