In the last three decades there has been an increasing emphasis on the importance of the use of fidelity assessment on improving the science of psychological, social, and behavioral research.
A cleanroom is an area or enclosure in which the air has to be cleaned to a defined particle limit, usually in particles per cubic foot. In the United States most cleanrooms are discussed in terms of Classification Limits.
The concept behind a cleanroom is to push air into the room from the top (green. arrows), down into the room, and then out vents at the floor level (blue arrows), carrying wth it any contaminants from the manufacturing process. ISO Class 4 = Federal standard Class 10.