Clean benches are designed to protect biological specimens by bathing the work area with HEPA filtered air that is free to particulate contamination. They were developed as an adjunct to clean room technology (the need to protect the work from contamination). In recent years, the use of the clean bench has spread from research and manufacturing to other fields such as aerospace, bioscience, pharmaceutical products and food processing.
Laminar flow clean benches are work benches or similar enclosures, which have their own filtered air supply. Laminar airflow is airflow in which the entire body of air within a confined area moves in a unidirectional velocity along parallel flow lines. In such cases, the fluid flow is free of macroscopic fluctuations.