Patent ID: 6152818
Filing Date: 2000-11-28
Classification: H01L

Abstract:
Apparatus for controlling the air flow through a semiconductor manufacturing wet bench of the type which requires the use of corrosive chemicals during the manufacture of the semiconductors, the wet bench having a work area in close proximity to a duct for exhausting air and fumes from the work area and a means for providing a negative pressure on the duct for exhausting air from the wet bench, said apparatus comprising:means for indicating a first mode of operation responsive to an operating signal being received that is indicative of the impending introduction of corrosive chemicals into the wet bench work area;means for varying the flow of exhausting air from the wet bench between at least a first and second volume responsive to said operating signals; anda controller means operatively connected to said mode indicating means and said flow varying means and adapted to generate said operating signals for controlling the operation of said varying means.