Air screen creating apparatus

Claim 1

AIR SCREEN CREATING APPARATUS ADAPTED TO BE POSITIONED ADJACENT A DOOR OPENING OR THE LIKE COMPRISING A HOLLOW CASING INCLUDING A GENERALLY CYLINDRICAL SIDE WALL FORMING A VOLUTE CASING, AXIAL END WALLS, AND A FLAT BASE PLATE FORMING AN EXTENSION OF SAID SIDE WALL, ONE EDGE OF SAID CYLINDRICAL SIDE WALL BEING SPACED FROM THE LOWER EDGE OF SAID BASE PLATE TO FORM THEREBETWEEN AN OUTLET PORT IN SAID CASING, MEANS DEFINING INLET OPENINGS IN SAID AXIAL END WALLS OF SAID CASING, A TAPERED SHROUD EXTENDING INWARDLY FROM EACH OF SAID INLET OPENINGS, A CENTRIFUGAL BLOWER MOUNTED INTERIORLY OF SAID CASING ADJACENT EACH INLET OPENING, A MOTOR MOUNTED ON SAID BASE PLATE BETWEEN SAID CENTRIFUGAL BLOWERS AND OPERATIVELY CONNECTED THERETO TO ACTUATE THEM SIMULTANEOUSLY, A TRIANGULARLY SHAPED BAFFLE MOUNTED INTERIORLY OF THE CASING ADJACENT SAID ONE EDGE OF SAID CYLINDRICAL SIDE WALL WHEREBY AIR DRAWN INTO THE INTERIOR OF THE HOUSING BY SAID CENTRIFUGAL BLOWERS ENGAGES SAID BAFFLE AND IS DIRECTED THROUGH SAID OUTLET PORT, SAID OUTLET PORT BEING DISPOSED ADJACENT A DOOR OPENING OR THE LIKE SO THAT THE AIR DISCHARGED THERETHROUGH PROVIDES AN AIR SCREEN AND AT LEAST ONE VANE ADJACENT A TERMINAL END OF SAID OUTLET PORT WHICH IS SELECTIVELY ADJUSTABLE SO THAT THE WIDTH OF THE AIR SCREEN CREATED MAY BE VARIED SELECTIVELY.