This is a device which incorporates HEPA filter/s and motor-blowers for the purpose of supplying Laminar (undirectional) Flow of clean air to the controlled work space. This air is directed in horizontal and vertical paths over the work area. Air Velocities are usually of the order of 0.36 m/sec to 0.56 m/sec.
These are manufactured in various sizes and with various optional accessories like anti-static grid, ultraviolet light, gas-cock etc. Special Clean benches are used for handling of harmful materials such as solvents, gas,powder etc. Negative pressure is maintained in the work area to prevent harmful materials to escape out. Class 100 cleanliness is maintained to supply air to work area.
The handling of dangerous etiological micro-organisms is performed within the biosafe cabinet. These cabinets maintain the interior of a workbench at negative pressure and partly or fully exhausted through HEPA Fliter.