Patent ID: 7988757

Claim:
An air filter cartridge comprising: (a) first and second, opposite, ends; (i) the first end having an air flow exit aperture therethrough; (b) pleated filter media: extending between the first and second ends; and, surrounding and defining an open filter interior; (c) outer framework having a sidewall structure circumscribing the media at least at a location adjacent the first end and having an outer surface; (d) a first member of a non-continuously threaded rotational engagement mechanism: positioned adjacent to, and spaced from, the first end and positioned on an outer surface of the outer framework; (i) the first member being integral with a remainder of the outer framework; (e) an axial seal ring on the first end at a location circumscribing the air flow exit aperture; and, (f) the second end having an outer, axial, central surface with a non-circularly shaped central recess therein.