A ‘clean room’ is a controlled environment generally used in the pharmaceutical industry for scientific research. As the term suggests, a clean room maintains a very high level of air quality, free of pollutants such as dust particles, airborne organisms and chemical vapors.
The ambient air outside in a typical city environment contains around 35,000,000 particles per cubic meter. According to ISO standards, an ISO1 clean room permits no more than 12 particles per meter cube. Many organizations high-efficiency V-Bank filters to create this controlled environment.