Air cleaner arrangements; components; and methods

An air cleaner assembly comprising:

• (a) a housing defining an interior;
• (i) the housing defining a service access end with a removable access cover positioned thereover;
• and,
• (ii) the access cover including a central projection thereon, extending into the housing interior from the access cover;
• (iii) the central projection on the access cover having a sidewall portion with a serpentine shape;
• (b) a filter cartridge positioned in the housing and comprising:
• (i) a media pack comprising pleated media surrounding an open interior;
• the media having first and second ends;
• (ii) a first end cap positioned on the media first end and extending completely across the first end of the media between media inner and outer perimeters;
• and,
• (iii) a second end cap positioned on the media second end and extending at least completely across the second end of the media between media inner and outer perimeters;
• (iv) a portion of one of the end caps including a radially directed surface having a serpentine shape with at least five each of alternating radially facing convex and radially facing concave portions;
• (A) the radially directed surface having a serpentine shape with an outer cross dimension that is smaller than an outer cross-dimension of an outermost portion of the media pack.