Air filtration arrangements having fluted media constructions and methods

Abstract

Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.

1 . A filter element arrangement comprising: 
 (a) a media pack having a substrate comprising first and second opposite flow faces and a plurality of flutes wherein in said media pack; 
 (i) each of said flutes have a first end portion adjacent to said first flow face and a second end portion adjacent to said second flow face;  
 (ii) selected ones of said flutes being open at said first end portion and closed at said second end portion; and selected ones of said flutes being closed at said first end portion and open at said second end portion  
 (iii) said substrate at least partially covered by a layer comprising fine fiber comprising a fiber with a diameter of about 0.01 to 0.5 microns such that the fiber, when tested under conditions of exposure for a test period of 16 hours to test conditions of 140° F. air at a relative humidity of 100%, retains greater than 30% of the fiber unchanged for filtration purposes