Anticontaminant work bench

Claim 1

THE COMBINATION PROVIDING AN ANTICONTAMINANT WORKING SPACE, COMPRISING: (A) HOUSING MEANS DEFINING A WORKING CHAMBER HAVING A TOP WALL STRUCTURE INCLUDING AN AIR FILTER HAVING A FRONT FACE AREA WITH FLUID FLOW DISCHARGE OPENINGS THEREIN EXTENDING ACROSS SUBSTANTIALLY THE ENTIRE WIDTH OF SAID CHAMBER; (B) BENCH MEANS INCLUDING A TOP WORKING SURFACE HAVING OPENINGS THEREIN, SAID WORKING SURFACE BEING POSITIONED IN THE WORKING CHAMBER BELOW THE AREA HAVING THE FLUID FLOW DISCHARGE OPENINGS THEREIN AND PROVIDING WITH SAID TOP WALL STRUCTURE AN ACCESS OPENING TO THE BENCH TOP WORKING SURFACE; (C) DUCT MEANS DEFINING A FLUID FLOW PATH EXTERIORLY OF SAID WORKING CHAMBER AND HAVING END CONNECTIONS IN COMMUNICATION RESPECTIVELY WITH SAID DISCHARGE OPENINGS OF THE TOP WALL STRUCTURE AND SAID BENCH TOP WORKING SURFACE OPENINGS; (D) MEANS FOR MOVING A FLUID IN SAID PATH AND THROUGH SAID WORKING CHAMBER BETWEEN SAID TOP WALL STRUCTURE AND THE BENCH TOP WORKING SURFACE; AND (E) SAID FILTER FRONT FACE AREA HAVING AT LEAST A PORTION THEREOF INCLINED WITH RESPECT TO THE BENCH TOP WORKING SURFACE SO THAT A PORTION OF THE DISCHARGED FLUID WILL BE DIRECTED THROUGH THE ACCESS OPENING AND FORM AN AIR CURTAIN EXTENDING THEREACROSS.