Introduction to Clean Benches

The laminar flow Clean Bench wholesale is a work bench or similar enclosure which has its own filtered air supply. The clean bench was 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, laminar flow cabinet or laminar flow hood has spread from research and manufacturing to other fields such as aerospace, bioscience, pharmaceutical production and food processing.
Today, laminar flow clean benches are used in a variety of applications throughout medical research laboratories, hospitals, manufacturing facilities and other research and production environments.
Clean Bench Function
The clean bench provides product protection by ensuring that the work in the bench is exposed only to HEPA-filtered air.
The clean bench is recommended for work with non-hazardous materials where clean, particle-free air quality is required.
It does not provide protection to personnel or to the ambient environment.
It is not designed to contain aerosols generated by the procedure; the user is exposed to these aerosols.
Laminar Airflow
Another common attribute in clean bench technology is laminar airflow. The following general definition applies to the application of laminar airflow in this literature.
Generally defined, laminar airflow is airflow in which the entire body of air within a confined area moves in a unidirectional velocity along parallel flow lines.
Technically defined, laminar airflow is the fluid flow in which air velocities are free of macroscopic fluctuations which occur when the Reynolds Number is less than 2000. (The Reynolds Number is the ratio of inertial to viscous forces in a pipe or duct.)
In a conventional laminar flow clean bench, particulates may contaminate the work area when hands or materials are placed inside the hood. The resulting turbulence creates backwash which allows dirty room air to enter the zone. Click to enlarge.
Particle-free air quality in the laminar flow Clean bench is accomplished with precise control of airflow volumes and velocities. Any obstruction will have a significant impact on laminar flow performance. Obstructions include work in process or materials placed inside the hood or on the hood surface. Federal Standard No. 209E does not account for obstructions.
Obstructions cause interruptions in airflow which allow particulates to enter the work area or clean room, sharply increasing particle counts inside the hood.
Backwash is the general term applied to the entry of unfiltered room air into the work area.
Backwash may be created when the user inserts a hand or materials into the work area.
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