Patent ID: 7736410

Claim:
An air cleaner assembly comprising: (a) a housing defining an interior and having: an air flow inlet section; an air flow outlet section; a primary filter cartridge receiving section between the air flow outlet section and the air flow inlet section; an access cover removably positioned on the primary filter cartridge receiving section; and, a primary filter cartridge housing radial seal surface; (i) the primary filter cartridge receiving section including at least first and second primary filter cartridge biasing tracks; (A) a first one of the at least two primary filter cartridge biasing tracks being spaced, axially, a first distance (D 10 ) from the housing radial seal surface; and, (B) a second one of the primary filter cartridge biasing tracks being spaced, axially, a second distance (D 20 ) from the housing radial seal surface; the first distance (D 10 ) being greater than the second distance (D 20 ); and, (C) the first biasing track within the primary filter cartridge receiving section having first u-shaped slide surface facing the air flow outlet section and facing away from the air flow inlet section; (D) the first u-shaped slide surface including side tips projecting toward the access cover and a center projecting away from the access cover; and, (b) a first removable and replaceable primary filter cartridge positioned within the housing; the first primary filter cartridge comprising a media pack having an inlet flow face and an opposite outlet flow face; (i) the media pack comprising a plurality of inlet flutes and outlet flutes extending between the inlet flow face and the opposite outlet flow face; (ii) the media pack being closed to passage of unfiltered air therethrough, between the inlet flow face and the outlet flow face; and, (iii) the primary filter cartridge including a housing seal member thereon in radial sealing engagement with the primary cartridge housing radial seal surface.