Patent ID: 8721757

Claim:
An air filter cartridge comprising: (a) a media pack comprising at least a first stack including a plurality of single facer strips defining opposite inlet and outlet flow faces; (i) each one of the plurality of single facer strips in the first stack comprising a sheet of fluted media secured to a sheet of facing media; (ii) the first stack including a stacking bead between adjacent single facer strips; (iii) the first stack including at least a first portion configured in an arcuate configuration of individual single facer strips oriented with respect to one another to form the arcuate configuration in at least a portion of at least one of the inlet and outlet flow faces; and, (iv) the media pack being closed to passage of unfiltered air completely therethrough; and, (v) the media pack being formed from at least one blocked, stack, at least a portion of which has been formed into the arcuate configuration; and, (b) a housing seal arrangement positioned on, and in extension around, the media pack.