Hybrid height pleated filter element

Abstract

A cylindrical hollow filter element is provided comprising repeated segments, each segment comprising, in order: (a) a first group of three pleats (M1, M2, M3), having corresponding pleat heights (H1, H2, H3), wherein H1＜H2＜H3; (b) a first septum L1 having a pleat height LH1; (c) a second group of three pleats (M4, M5, M6), having corresponding pleat heights (H4, H5, H6), wherein H4＜H5＜H6, and H4＞H1, H5＞H2, and H6＞H3; (d) a second septum L2, having a pleat height LH2; (e) inverted pleat W, having a pleat height WH; (f) third septum L3, having a pleat height LH3, wherein one side of L2 and one side of L3 form the inverted pleat W, and wherein LH1, LH2, LH3, and WH, are each greater than each of H1-H6.

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