Filter cartridges; air cleaner assemblies; housings; features; components; and, methods

An air filter cartridge comprising:

• (a) a media pack comprising filter media and having first and second, opposite, flow ends;
• (i) the first flow end comprising an inlet flow end;
• (ii) the second flow end comprising an outlet flow end;
• and,
• (iii) the media pack being configured to filter air flowing into the inlet flow end prior to the air exiting the outlet flow end;
• and,
• (b) a housing seal arrangement positioned on the media pack;
• (i) the housing seal arrangement defining an air flow passageway;
• (ii) the housing seal arrangement comprising a first radially outwardly directed, seal member defining a first radial seal surface oriented to releasably, sealingly engage surrounding structure, in use;
• (iii) the first radial seal surface defining a perimeter-direction in extension around the flow passageway;
• (iv) the first radial seal surface having a modified oval perimeter shape including first and second opposite arcuate seal surface sections separated by first and second opposite non-wavy side seal surface sections;
• and,
• (iv) at least one of the first and second opposite arcuate seal surface sections including a radially directed portion comprising an alternating radial projection/recess configuration comprising at least two projections and three recesses in extension along a portion of the perimeter-direction.