Fan

Claim 1

A CENTRIFUGAL FAN HAVING A SINGLE INLET AND A MULTIPLE OUTLET FOR RECIRCULATING AIR AND OTHER GASES, COMPRISING TWO OUTSIDE WALLS AND AN INTERNAL WALL FORMING A HOUSING HAVING TWO SCROLL-SHAPED PASSAGES OF EQUAL SIZE IN JUXTAPOSITION AND ON A COMMON AXIS AND WITH SEPARATE OUTLETS IN SAID HOUSING DIAMETRICALLY OFFSET ANGULARLY FROM ONE ANOTHER, A BELL-MOUTH INLET IN THE OUTSIDE WALL OF THE HOUSING FORMING ONE OF SAID PASSAGES, THE WALL SEPARATING SAID PASSAGES HAVING AN AXIALLY ARRANGED OPENING ALIGNED WITH SAID INLET AND FORMING A CENTRALLY LOCATED WHEEL CHAMBER, A SHAFT AXIALLY ALIGNED WITH SAID INLET EXTENDING INTO SAID CHAMBER, A WHEEL MOUNTED ON SAID SHAFT AND HAVING A PLURALITY OF BLADES AT THE PERIPHERY THEREOF, CONDUITS CONNECTED TO SAID OUTLETS AND EXTENDING IN A DIRECTION AXIAL WITH SAID WHEEL ON THE SAME SIDE AS SAID INLET OPENING, AND A PARTITION IN SAID WHEEL FOR DIVIDING THE FLOW TO SAID OUTLETS IN SUBSTANTIALLY EQUAL PORTIONS, SAID PARTITION HAVING A RADIAL PORTION INTERSECTING SAID BLADES ADJACENT THE WALL SEPARATING SAID PASSAGES AND AN AXIAL TUBULAR PORTION CONNECTED WITH SAID RADIAL PORTION WITH A SWEEPING CURVED SECTION AND SPACED FROM THE SIDES OF AND CONCENTRIC WITH THE SIDES OF SAID INLET OPENING AND PROJECTING OUTWARDLY BEYOND THE INNER END OF SAID BELLMOUTH INLET, SAID TUBULAR PORTION FORMING A CONDUIT CONNECTING THE INLET WITH ONE OF SAID PASSAGES AND THE SPACE BETWEEN SAID TUBULAR PORTION AND THE SIDES OF SAID INLET FORMING A CONDUIT CONNECTING THE INLET WITH THE OTHER OF SAID PASSAGES.