Patent ID: 7981187

Claim:
An air filter element comprising: (a) a media pack having first and second ends; (i) the media pack surrounding and defining an open central volume; and, (ii) the media pack extending between first and second end caps; (b) the first end cap comprising a molded-in-place end cap defining a radially inwardly directed housing seal member; (i) the first end cap being an open end cap with an air flow aperture therethrough; and, (c) the second end cap having a closed central region; (i) the second end cap closed central region being surrounded by the media pack; (ii) the second end cap central region including a wall with a projection segment projecting into the open central volume, from the second end of the media pack, an axial distance of at least 6 mm; (iii) the second end cap central region including an axially projecting central projection with a sidewall that tapers downwardly to a closed end; (iv) the axially projecting central projection projecting from an adjacent portion of the central region at least 5 mm; and (v) the central projection defining a hollow recess having a sidewall surface.