Patent ID: 7972405

Claim:
An air filter cartridge arrangement comprising: (a) a media pack having an inlet end and an opposite outlet end; (i) the media pack including fluted media oriented with flutes extending in a direction between the inlet end and the outlet end; and, (b) a sidewall arrangement having first and second sides with the media pack positioned therebetween; (i) the sidewall arrangement including a pair of first and second, axially and vertically spaced, projections on the first side; (A) axial spacing between the first and second projections comprising spacing in a direction corresponding to a direction between the inlet end and the opposite outlet end; and, (B) vertical spacing between the first and second projection comprising spacing in a direction corresponding to a direction perpendicular to the direction between the inlet end and the opposite outlet end; and, (ii) the sidewall arrangement including a pair of third and fourth, axially and vertically spaced, projections on the second side; (A) axial spacing between the third and fourth projections comprising spacing in a direction corresponding to a direction between the inlet end and the opposite outlet end; and, (B) vertical spacing between the third and fourth projections comprising spacing in a direction corresponding to a direction perpendicular to the direction between the inlet end and the opposite outlet end.