Patent ID: 9623362
Date: 2017-04-18
CPC Classifications: B01D,F02M

Claim:
1. A filtration media pack comprising: (a) a plurality of layers of single face media comprising a fluted sheet, a facing sheet, and a plurality of flutes extending between the fluted sheet and the facing sheet; (b) a first portion of the plurality of flutes being closed to unfiltered air flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes being closed to unfiltered air flowing out of the second portion of the plurality of flutes, such that air passing into one of the first face or the second face of the media pack and out the other of the first face or the second face of the media pack passes through media to provide filtration of the air; and wherein at least one of the flutes comprises at least one contact region between the single face media and the fluted sheet, the contact region comprising at least one permeable protrusion extending from at least one of the facing sheet and fluted sheet.