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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

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.

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1. A filter element arrangement comprising:(a) a media pack including a corrugated substrate secured to a non-corrugated substrate; each substrate being selected from media comprising natural fibers and media comprising a mixture at natural and synthetic fibers; each substrate having a filter effici

1. A filter element arrangement comprising:(a) a media pack including a corrugated substrate secured to a non-corrugated substrate; each substrate being selected from media comprising natural fibers and media comprising a mixture at natural and synthetic fibers; each substrate having a filter efficiency measured under ATSM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m?2, said substrates forming a plurality of flutes in said media pack; wherein: (i) selected ones of said flutes are open at a first end portion and closed at a second end portion; and selected ones of said flutes being closed at a first end portion and open at a second end portion; and (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a line fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm?2, the fine fiber comprising a polymer selected from the group consisting or: (A) nylon 66, the fine fiber having a fiber size of about 0.01 to 0.5 micron; (B) a blend of a hydrophobic additive and a polymer comprising a blend of at least two different nylon polymers, the fine fiber having a fiber size of about 0.01 to 0.5 micron; (C) a blend of a hydrophobic additive and a nylon polymer comprising a nylon other than a copolymer formed from a cyclic lactam and a C6-10 diamine monomer or a C6-10 diacid monomer, the fine fiber having a fiber size of about 0.01 to 0.5 micron; or (D) mixtures thereof; (c) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use. 2. A filter element arrangement according to claim 1 wherein:(a) the seal system comprises a flexible, compressible seal member positioned over a frame. 3. A filter element arrangement according to claim 2 wherein:(a) the frame comprises a member positioned at an end of the media pack to project axially outwardly from the end of the media pack. 4. A filter element arrangement according to claim 3 wherein:(a) the frame includes at least one cross-brace therein, in extension over an end of the media pack. 5. A filter element arrangement according to claim 4 wherein:(a) the media pack comprises a coiled, cylindrical shape. 6. A filter element arrangement according to claim 4 wherein:(a) the media pack comprises a coiled, shape having a non-circular cross-section. 7. A filter element arrangement according to claim 6 wherein:(a) the media pack has a racetrack shape with two opposite curved ends and two, opposite, straight sides. 8. A filter element arrangement according to claim 6 wherein:(a) the media pack comprises a coiled media configuration having: a first pair of opposite sides; a second pair of opposite sides; and, four rounded corners. 9. A filter element arrangement according to claim 2 wherein:(a) the media pack has opposite inlet and outlet flow faces; and, (b) the seal system comprises a flexible, compressible polyurethane member positioned around the media pack at a location between the opposite flow faces. 10. A filter element arrangement according to claim 9 wherein:(a) the flexible, compressible polyurethane member of the seal system is secured to an outside surface of the media pack on filter media. 11. A filter element arrangement according to claim 6 wherein:(a) the flexible, compressible polyurethane member of the seal system is secured to a construction attached to the media. 12. A filter element arrangement according to claim 1 including:(a) a handle mechanism projecting outwardly from an end of the media pack. 13. A filter element arrangement according to claim 1 wherein:(a) the media is coiled around a central core. 14. A filter element arrangement according to claim 1 wherein:(a) the media pack is frusto-conical. 15. The filter element arrangement of claim 1 wherein the fine fiber comprises nylon 66 and a hydrophobic additive.16. The filter element arrangement of claim 1 wherein the fine fiber is such that after exposure to air at 140° F. and 100% relative humidity for 1 to 16 hours at least 50% of the fine fiber layer remains substantially unchanged.17. The filter element arrangement of claim 1 wherein the fine fiber layer is such that if it is exposed to an alcoholic solvent at 70° F. at least 50% of the fiber remains, after 5 minutes, substantially unchanged.18. The filter element arrangement of claim 1 wherein the fine fiber has a diameter of 0.1 to 0.2 micron.19. The filter element arrangement of claim 1 wherein the hydrophobic additive comprises an oligomer having a molecular weight of about 500 to 3000 and an aromatic character wherein the additive is miscible in the fine fiber polymer, said additive forming a coating on tho fiber.20. The filter element arrangement of claim 1 wherein in the blend of two nylon polymers, the second nylon polymer differs in molecular weight or monomer composition.21. The filter element arrangement of claim 1 wherein the polymer blend comprises a nylon 64 and a nylon 6 10.22. The filter element arrangement of claim 1 wherein the polymer blend comprises a nylon 66 and a nylon 6 10.23. The filter element arrangement of claim 1 wherein the polymer blend comprises a nylon 64 and a nylon 66.24. The filter element arrangement of claim 1 wherein the hydrophobic additive comprises an oligomer comprising a phenol compound.25. The filter element arrangement of claim 24 wherein the hydrophobic additive comprises an oligomer comprising tertiary butyl phenol.26. The filter element arrangement of claim 1 wherein the hydrophobic additive comprises an oligomer comprising a phenol compound.27. The filter element arrangement of claim 26 wherein the hydrophobic additive comprises an oligomer comprising tertiary butyl phenol.28. A filter element arrangement comprising:(a) a media pack including a corrugated substrate secured to a non-corrugated substrate; each substrate being selected from media comprising natural fibers and media comprising a mixture of natural and synthetic fibers; each substrate having a filter efficiency measured under ASTM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m?2, said substrates forming a plurality of flutes in said media pack; wherein: (i) selected ones of said flutes are open at a first end portion and closed at a second end portion; and selected ones of said flutes being closed at a first end portion and open at a second end portion; and (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a fine fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm?2, the fine fiber comprising a polyvinyl alcohol polymer, the fiber having a fiber size of about 0.01 to 0.5 micron; (c) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use. 29. A filter element arrangement according to claim 28 wherein:(a) the seal system comprises a flexible, compressible seal member positioned over a frame. 30. A filter element arrangement according to claim 29 wherein:(a) the frame comprises a member positioned at an end of the media pack to project axially outwardly from the end of the media pack. 31. A filter element arrangement according to claim 30 wherein:(a) the frame includes at least one cross-brace therein, in extension over an end of the media pack. 32. A filter element arrangement according to claim 31 wherein:(a) the media pack comprises a coiled, cylindrical shape. 33. A filter element arrangement according to claim 31 wherein:(a) the media pack comprises a coiled, racetrack, shape having two, opposite, curved ends and two, opposite, straight sides. 34. A filter element arrangement according to claim 29 wherein:(a) the media park has opposite inlet and outlet flow faces; and, (b) the seal system comprises a flexible, compressible polyurethane member positioned around the media pack at a location between the opposite flow faces. 35. A filter element arrangement according to claim 34 wherein:(a) the flexible, compressible polyurethane member of the seal system is secured to an outside surface of the media pack on filter media. 36. A filter element arrangement according to claim 34 wherein:(a) the flexible, compressible polyurethane member of the seal system is secured to a construction attached to the media. 37. A filter element arrangement according to claim 28 wherein:(a) the media pack comprises a coiled media configuration having: a first pair of opposite, generally parallel, sides; a second pair of apposite, generally parallel, sides; and four rounded corners. 38. A filter element arrangement according to claim 28 including:(a) a handle mechanism projecting outwardly from an end of the media pack. 39. A filter element arrangement according to claim 28 wherein:(a) the media is coiled around a central core. 40. A filter element arrangement according to claim 28 wherein:(a) the media pack is frusto-conical. 41. The filter element arrangement of claim 28 wherein the polyvinyl alcohol is cross-linked with about 1 to 40 wt. % of a crosslinking agent.42. The filter element arrangement of claim 28 wherein the crosslinking agent comprises an acrylic polymer.43. The element of claim 42 wherein the crosslinked polyvinylalcohol is crosslinked using a polyacrylic acid having a molecular weight of about 1000 to 3000.44. The element of claim 42 wherein the crosslinked polyvinylalcohol is crosslinked using a melamine-formaldehyde resin having a molecular weight of about 1000 to 3000.45. The filter of claim 28 wherein the polyvinyl alcohol has a degree of hydrolysis of about 87 to 99.9%.46. The filter of claim 28 wherein the polyvinyl alcohol has a degree of hydrolysis of about 99.9%.47. A filter element arrangement comprising:(a) a media pack including corrugated substrate secured to a non-corrugated substrate; each substrate being selected from media comprising natural fibers and media comprising a mixture of natural and synthetic fibers; each substrate having a filter efficiency measured under ASTM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m?2, said substrates forming a plurality of flutes in said media pack; wherein: (i) selected ones of said flutes are open at a first end portion and closed at a second end portion; and selected ones of said flutes being closed at a first end portion and open at a second end portion; and (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a fine fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm?2, the fine fiber comprising a polyvinyl chloride polymer, the fiber having a fiber size of about 0.01 to 0.5 micron; (b) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use. 48. A filter element arrangement according to claim 47 wherein:(a) the seal system comprises a flexible, compressible seal member positioned over a frame. 49. A filter element arrangement according to claim 48 wherein:(a) the frame comprises a member positioned at an end of the media pack to project axially outwardly from the end of the media pack. 50. A filter element arrangement according to claim 48 wherein:(a) the frame includes at least one cross-brace therein, in extension over an end of the media pack. 51. A filter element arrangement according to claim 49 wherein:(a) the media pack comprises a coiled, cylindrical shape. 52. A filter element arrangement according to claim 50 wherein:(a) the media pack comprises a coiled, racetrack, shape having two, opposite, curved ends and two, opposite, straight sides. 53. A filter element arrangement according to claim 48 wherein:(a) the media pack has opposite inlet and outlet flow faces; and, (b) the seal system comprises a flexible, compressible member positioned around the media pack at a location between the opposite flow faces. 54. A filter element arrangement according to claim 53 wherein:(a) the flexible, compressible member of the seal system is secured to an outside surface of the media pack on filter media. 55. A filter element arrangement according to claim 53 wherein:(a) the flexible, compressible member of the seal system is secured to a construction attached to the media. 56. A filter element arrangement according to claim 47 wherein:(a) the media pack comprises a coiled media configuration having: a first pair of opposite, generally parallel, sides; a second pair of opposite, generally parallel, sides; and four rounded corners. 57. A filter element arrangement according to claim 47 including:(a) a handle mechanism projecting outwardly from an end of the media pack. 58. A filter element arrangement according to claim 47 wherein:(a) the media is coiled around a central core. 59. A filter element arrangement according to claim 47 wherein:(a) the media pack is frusto-conical. 60. The filter element arrangement of claim 47 wherein the fine fiber comprises a blend of two polyvinyl chloride polymers and has a diameter of 0.01 to 0.5 micron.61. The filter element arrangement of claim 47 wherein the fine fiber has a diameter of 0.01 to 0.2 micron.62. The filter element arrangement of claim 47 wherein the media, when exposed to an air stream having a temperature of about 140° F. and a relative humidity of about 100%, greater than about 50% of the fiber survives for more than 16 hours.63. The filter element arrangement of claim 47 wherein each substrate comprises a woven or non-woven substrate.64. The filter element arrangement of claim 51 wherein the non-woven substrate comprises a fiber selected from cellulose, glass, polymer, metal, and combinations thereof.65. The filter element arrangement of claim 47 wherein each substrate comprises spunbonded polymeric non-woven fabric.66. The filter element arrangement of claim 47 wherein each substrate comprises a non-woven polymeric fabric.