Patent ID: 7179050

Claim:
Radial fan with a casing ( 1 , 2 ) and in it an axially arranged fan wheel ( 3 ), wherein the casing has an axially placed air inlet ( 4 ), an exhaust ( 5 ), a bottom section ( 6 ) with a bottom reference surface ( 7 ) and a spiral-shaped compression space located radially around the wheel that extends to the exhaust and which expands both in a radial as well as an axial direction towards the exhaust ( 5 ); and the wheel ( 3 ) has a cover disk ( 11 ) facing the air inlet ( 4 ) and a supporting disk ( 12 ); wherein an axial and radial extension on the casing is formed over at least 180° of the spiral circumference; and a hollow cylindrical cup-like section ( 9 ) is recessed in the bottom section ( 6 ) in an axial direction extending beyond the bottom reference surface ( 7 ) in which the wheel ( 3 ) is placed in such a way that an inner side ( 12 a ) of the supporting disk ( 12 ) of the wheel ( 3 ) is flush with the bottom reference surface ( 7 ), a tab ( 18 ) is placed in the casing ( 1 ) which essentially extends in the circumferential direction in the compression space ( 8 ), and a guide edge ( 20 ) formed by the tab ( 18 ) in a lateral projection forms different angles with the bottom reference surface ( 7 ) of the fan.