Exhauster including venturi means

Claim 1

AN EXHAUST FIXTURE FOR AN INTERIOR CHAMBER COMPRISING AN OUTFLOW PIPE SECTION ADAPTED TO CONNECT TO SAID CHAMBER, SAID PIPE SECTION HAVING AN OUTLET OPENING, A FIRST AIRFOIL SURROUNDING THE OUTLET OPENING, SAID FIRST AIRFOIL COMPRISING A HOUSING HAVING A WALL ON THE SIDE OF SAID FIRST AIRFOIL OPPOSITE FROM SAID PIPE SECTION, THE EXTERIOR OF SAID WALL BEING CONVEX IN A DIRECTION OPPOSITE FROM THE PIPE SECTION, SAID WALL HAVING AN EXHAUST APERTURE THEREIN SUBSTANTIALLY IN ALIGNMENT WITH SAID OUTLET OPENING, THERE BEING AN ANNULAR FLANGE AROUND SAID EXHAUSAT APERTURE, AN OUTERMOST RIM PORTION OF SAID FLANGE BEING SUBSTANTIALLY PARALLEL TO THE FLOW PATH FROM SAID OUTLET OPENING THROUGH SAID EXHAUST APERTURE WHEREBY TO DIRECT EXTERIOR AIR ENDWISE RELATIVE TO SAID RIM PORTION, A SECOND AIRFOIL COMPRISING A HOUSING MOUNTED AT A SPACED LOCATION FROM SAID FIRST AIRFOIL, SAID SECOND AIRFOIL COMPRISING A RELATIVELY FLAT WALL SUBSTANTIALLY PARALLEL TO THE TRANSVERSE PLANE OF SAID FLANGE AND SPACED OUTWARDLY THEREFROM, AN OUTER ANNULAR PORTION OF SAID RELATIVELY FLAT WALL BEING SPACED FRON AN OUTER ANNULAR PORTION OF THE WALL OF SAID FIRST AIRFOIL A DISTANCE GREATER THAN THE DISTANCE BETWEEN SAID RIM AND SAID RELATIVELY FLAT WALL, SAID DISTANCE BEING PROGRESSIVELY LARGER TOWARD THE OUTER PERIPHERY, WHEREBY TO INDUCE PASSAGE OF AIR FROM SAID EXHAUST APERTURE.