Patent ID: 8702831

Claim:
An air filter cartridge comprising: (a) first and second, opposite, ends; (i) the first end having an air flow exit aperture therethrough; (b) a conical extension of filter media, extending between the first and second ends, surrounding an open interior and defining a central cartridge axis; (c) a first, open, end cap adjacent the first end of the filter cartridge; (d) a housing seal positioned on the first end cap and including a seal surface directed radially, with respect to the cartridge central axis, to form a removable seal with a portion of an air cleaner, in use; and, (e) a second, closed, end cap adjacent the second end of the filter cartridge; (i) the second end cap having a central portion including: an inner surface portion in overlap with the central interior and directed toward the first end cap; and, an outer surface opposite the inner surface portion; (ii) the second end cap central portion axially projecting inwardly of the filter cartridge to a location surrounded by media and defining an outer surface recess in the outer surface thereof; (iii) the central portion including a central projection on the outer surface surrounding and defining an inner recess in the inner surface that is open toward the first end cap; and, (iv) the outer surface recess surrounding the central projection on the outer surface.