Patent ID: 7425226
Filing Date: 2008-09-16
Classification: B01D,F24F

Abstract:
1. A composite filter assembly comprising a plurality of filter members each supporting a fanfold filter element comprising a plurality of canted pleats of a fluid filtering media, each pleat having opposite sidewalls on opposite sides of a fold forming a pocket of the pleat, and said plurality of pleats having alternating folds forming adjacent pockets with openings facing in opposite directions, said opposite sidewalls having different heights so that a central plane equidistant therebetween is canted at an acute angle of less than 85 degrees relative to a plane tangent to an outer surface of the folds of said pleats on one side of said filter element; and securing means for securing said canted pleats together to maintain said cant angle; the cant angle of said canted filter element being sufficient to substantially increase a surface area of the filtering media as compared to a surface area of the same filtering media in a non-canted filter element having pleats formed with opposite sidewalls equidistant from a central plane that is at an angle of 90 degrees relative to said tangent plane, where the overall depths of said canted and non-canted filtering elements are substantially the same, and wherein said filter members are arranged one adjacent to another with a canted end of said one filter member in abutment with a canted end of said another filter member to form a V-formation in which the tangent planes of said adjacent members intersect at a composite angle that is substantially equal to a sum of the respective cant angles of said adjacent members.