Cleanroom Classification

How cleanrooms are classified:

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 relates FS to ISO classifications:

Federal Standard	ISO
	1
	2
1	3
10	4
100	5
1,000	6
10,000	7
100,000	8
	9

The following graph shows particle size vs. particles per cubic foot for various cleanroom classes: