Centrifugal fan

Claim 1

A CENTRIFUGAL FAN COMPRISING, A. SCROLL-TYPE HOUSING WITH ONE WALL HAVING AN AXIAL AIR-INLET THEREIN, AND AN AIR-OUTLET ION A PLANE PARALLEL TO THER AXIS OF ROTATION, B. A FAN-WHEEL WITH AN AXIAL AIR-INLET IN ONE PLATE THEREOF ROTATIBELY JOURNALED IN THE HOUSING IN AXIALLY-SPACED RELATIONSHIP TO THE ONE WALL OF THE HOUSING, C. AN ANNULAR ELEMENT CONNECTING THE HOUSING AIR-INLET TO THE FAN-WHEEL AIR-INLET, AND D. A FLAT DIVERTER PLATE OF A WIDTH SUBSTANTIALLY EQUAL TO THE AXIAL DIMENSION OF THE ANNULAR ELEMENT HAVING ONE EDGE CONTOURED TO CONFORM TO THE EXTERIOR OF THE ANNULAR ELEMENT AND SUBTENDING A RIGHT ANGLE FORMED BY THE TWO OTHER EDGES THEREOF, BEING MOUNTED ON THE ANNULAR ELEMENT WITH THE CONTOURED EDGE IN DIRECT SUPPORTING CONTACT WITH THE ELEMENT AND ONE OF THE TWO OTHER EDGES PREDETERMINEDLY SPACED FROM THE AIR-INLET WALL OF THE FAN-WHEEL, WITH THE OTHER OF THE TWO EDGES SPACED FROM THE UPPER END OF THE CUT-OFF SHEET, AND HAVING THE PLANE OF THE CONVERTER PLATE DISPOSED SUBSTANTIALLY IN ALIGNMENT WITH THAT PORTION OF THE HOUSING WHICH DEFINES THE AXIALLY-DISPOSED INNER PERIMETER OF THE AIR-OUTLET MOST DIRECTLY ADJACENT THE FAN-WHEEL AND THEREBY, RESTRICTING THE RECIRCULATION OF AN AIR CURRENT WITHIN THE HOUSING WHILE ALLOWING A SMALL AMOUNT OF AIR TO PASS THROUGH THE SPACE BETWEEN THE DIVERTER PLATE AND HOUSING CUT-OFF TO STABILIZE THE FLOW, BUT NOT INTERFERRING WITH AN AIR CURRENT CREATED SKINFRICTION OF THE AIR-INLET WALL OF THE FAN-WHEEL, AND THEREBY RESTRICTING THE RECIRCULATION OF AN AIR CURRENT WITHIN THE HOUSING BUT NOT INTERFERRING WITH AN AIR CURRENT CREATED SKINFRICTION OF THE AIR-INLET WALL OF THE FAN-WHEEL.