Patent ID: 6927363

Claim:
An exhaust apparatus for evacuating vapor during baking of liquid chemicals deposited on substrates, comprising: a heating chamber containing a hot plate for horizontally supporting and heating a substrate; a cover plate suspended horizontally over said hot plate; said cover plate having a top surface, a bottom surface, and periphery; said cover plate having a plurality of exhaust ports extending from said top to said bottom surfaces, said plurality of exhaust ports are positioned to effectively prevent amalgamation of crystals on said bottom surface of said cover plate; a manifold structure horizontally mounted to the top surface of said cover plate, said manifold structure having conduits connecting each exhaust port to a common enclosure, said manifold structure further comprising: adjustable dampers disposed at frontward openings of said conduits, said dampers having adjustable pivoting gates for controlling vapor flow through each exhaust port to said common enclosure; and an exhaust pipe coupled to a top of said common enclosure for exhausting vapor to external recovery means.