Patent ID: 7122067

Claim:
An intake air filter for an internal combustion engine, in particular in a motor vehicle, comprising a filter housing ( 2 ) which has a crude air inlet ( 4 ) and a clean air outlet ( 5 ) and comprising a ring filter insert ( 3 ) which is situated in the filter housing ( 2 ) and through which the air flows radially from the outside to the inside, having a first end disk ( 10 ) on one axial end, said disk having at least one opening ( 12 ) through which the clean air outlet ( 5 ) communicates with the interior ( 8 ) of the ring filter insert ( 3 ), whereby the filter housing ( 2 ) has a secondary air outlet ( 6 ) on the clean side and whereby the ring filter insert ( 3 ) has a second end disk ( 11 ) on one axial end which faces away from the first end disk ( 10 ), said second end disk having at least one opening ( 17 ), wherein the secondary air outlet ( 6 ) communicates through the opening ( 17 ) in the second end disk ( 11 ) with the interior ( 8 ) of the ring filter insert ( 3 ).