Patent ID: 7572310

Claim:
An air cleaner comprising: (a) a housing having an outer wall, an open end for insertion and removal of a filter element, and an air flow outlet tube; (b) a filter element positioned within the housing and comprising: (i) a media pack having first and second, opposite, ends; said media pack defining a central, open, volume; (ii) a first end cap at said first end of said media pack; said first end cap having a central aperture in flow communication with said central, open, volume; (iii) a closed second end cap at said second end of said media pack; said closed second end cap having a closed central region; (A) said closed central region being circumscribed by said media pack; (B) said central region including a central rim projecting into said open volume from said second end of said media pack; and (c) an air cleaner access cover removably positioned over the housing open end; (i) the air cleaner access cover having an inner side including a non-circular central projection constructed and arranged to interlock with the second end cap.