Air cleaner arrangement with end support for cartridge; components; and, methods

An air filter cartridge comprising:

• (a) filter media extending from a first end to a second end in an axial direction, and surrounding an open interior;
• (b) a first end piece having an air flow aperture therethrough and located on the filter media first end;
• (c) a housing seal arrangement positioned on the first end piece;
• and,
• (d) a second end piece closed to air flow therethrough and located on the filter media second end;
• (i) the second end piece includes a projection arrangement extending from the second end piece in a direction away from the first end piece;
• (ii) the projection arrangement including a wall having an outer surface and an inner surface, and the wall extends about a central portion of the second end piece;
• and
• (iii) the inner surface and the outer surface of the wall comprises a plurality of spaced radially outwardly projecting sections.