Patent ID: 6994744

Claim:
A filter arrangement comprising: (a) a first filter element having opposite first and second ends; an axial length between said first and second ends; and a plurality of flutes forming a fluted construction having a central core; (i) each of said flutes having a first end portion adjacent to said first filter element first end, and a second end portion adjacent to said first filter element second end; (A) 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; (ii) the first filter element having a non-circular cross-section with opposite curved ends joined by segments; (b) a sleeve member circumscribing said first filter element; (i) said sleeve member having a cross-section sized to receive the first filter element; (ii) said sleeve member having a wall with a length that extends greater than 50% of an axial length of the first filter element; (c) a seal member pressure flange extending radially from said sleeve member and fully circumscribing said sleeve member; (i) said seal member pressure flange including first and second opposite axial surfaces; (ii) said seal member pressure flange extending radially from said wall of said sleeve member by a distance of at least 0.1 inch; (iii) said seal member pressure flange being curved into a shape; and (d) a seal member positioned against the first axial surface of said seal member pressure flange to form a seal between and against the seal member pressure flange and a filtration system, when installed in the filtration system; (i) the seal member pressure flange operating as a backstop to support the seal member.