Antismudging air diffusers

Claim 1

AN ANTISMUDGING AIR DIFFUSER FOR OUTLETS OF AIR DISTRIBUTION SYSTEMS COMPRISING A RADIALLY OUTERMOST, HOLLOW, FIRST RING MEMBER WHICH FLARES RADIALLY OUTWARDLY FROM A RADIALLY CENTRAL OPENING IN THE UPSTREAM SIDE OF SAID RING MEMBER, A SECOND HOLLOW RING MEMBER CONCENTRICALLY POSITIONED IN SAID FIRST RING MEMBER, SAID SECOND RING MEMBER HAVING AN OPENING IN THE UPSTREAM SIDE AND FLARING RADIALLY OUTWARDLY IN A DOWNSTREAM DIRECTION FROM SAID OPENING IN SAID SECOND RING MEMBER, SAID FIRST AND SECOND RING MEMBERS DEFINING AN ANNULAR, RADIALLY OUTWARDLY EXTENDING AIR FLOW PASSAGE THEREBETWEEN, SAID SECOND RING MEMBER HAVING IN SAID RADIALLY OUTWARDLY EXTENDING PASSAGE AN ANNULAR CONVEX SURFACE, SAID RADIALLY OUTERMOST, FIRST RING MEMBER HAVING IN SAID RADIALLY OUTWARDLY EXTENDING PASSAGE AN ANNULAR, CONVEX SURFACE OPPOSITE SAID FIRST-MENTIONED ANNULAR CONVEX SURFACE, SAID CONVEX SURFACES DEFINING IN SAID RADIALLY OUTWARDLY EXTENDING PASSAGE AN ANNULAR VENTURI THROAT THEREBETWEEN, THE UPSTREAM, ENTRY SIDE OF SAID PASSAGE HAVING A CROSS-SECTIONAL AREA SUBSTANTIALLY SMALLER THAN THE CROSSSECTIONAL AREA OF THE DOWNSTREAM, DISCHARGE SIDE OF SAID PASSAGE TO INTERCEPT AND DISCHARGE RADIALLY OUTWARDLY THE RADIALLY OUTER PORTION OF A SUPPLY AIR STREAM SUPPLIED TO THE AXIALLY REARWARD SIDE OF SAID DIFFUSER AS A RADIALLY OUTWARDLY FLOWING SECONDARY JET OF DISCHARGE AIR HAVING A VELOCITY SUBSTANTIALLY LESS THAN THE VELOCITY OF SAID SUPPLY AIR STREAM, AND AIR-DEFLECTING, AIR-PASSAGE MEANS SPACED RADIALLY INWARDLY OF SAID SECOND RING MEMBER AND POSITIONED AXIALLY FORWARDLY OF SAID OPENING IN THE UPSTREAM SIDE OF SAID SECOND RING MEMBER FOR INTERCEPTING AND DEFLECTING RADIALLY OUTWARDLY THE REMAINING PORTION OF SAID SUPPLY STREAM AS A RADIALLY OUTWARDLY FLOWING MAIN JET OF DISCHARGE AIR, THE TOTAL CROSS-SECTIONAL AREA OF SAID AIR-PASSAGE MEANS AT THE UPSTREAM, ENTRY SIDE OF SAID PASSAGE MEANS BEING GREATER THAN THE TOTAL CROSS-SECTIONAL AREA OF SAID PASSAGE MEANS AT THE DOWNSTREAM, DISCHARGE SIDE OF SAID PASSAGE MEANS, WHEREBY SAID MAIN JET OF DISCHARGE AIR HAS A VELOCITY GREATER THAN THE VELOCITY OF SAID SUPPLY AIR STREAM.