Patent ID: 6872431

Claim:
A filter media construction comprising: (a) at least 3 spaced fine fiber layers; (i) said at least 3 spaced fine fiber layers comprising a first fine fiber layer, a second fine fiber layer, and a third fine fiber layer; each of the first, second and third fine fiber layers having an average fiber diameter of no greater than 5 microns; (ii) each of the first, second and third fine fiber layers comprising fibers having diameters of no greater than 8 microns; (iii) each of the first, second and third fine fiber layers having a thickness of no more than 20 microns; (b) a permeable coarse fiber layer separating each one of the fine fiber layers from a next adjacent one of the fine fiber layers; (i) each coarse fiber layer comprising fibers at least 10 microns in diameter; (ii) each coarse fiber layer having a thickness of no more than 254 microns; (c) the filter media construction having a thickness of no greater than 0.15 cm; and (d) the filter media construction being one of: (i) pleated; and (ii) corrugated.