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Filter arrangements include a barrier media, usually pleated, treated with a deposit of fine fibers. The media is particularly advantageous at high temperature (greater than 140째 F.) systems. Such systems may include engine systems and fluid compressor systems. Filter arrangements may take the form

Filter arrangements include a barrier media, usually pleated, treated with a deposit of fine fibers. The media is particularly advantageous at high temperature (greater than 140째 F.) systems. Such systems may include engine systems and fluid compressor systems. Filter arrangements may take the form of tubular, radially sealing elements; tubular, axial sealing elements; forward flow air cleaners; reverse flow air cleaners; and panel filters.

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What is claimed is: 1. A filter element comprising: (a) a media pack comprising: (i) a construction of a media composite; said construction including a substrate having a plurality of pleats having a length extending from said first end to said second end, the substrate comprising a filter medium h

What is claimed is: 1. A filter element comprising: (a) a media pack comprising: (i) a construction of a media composite; said construction including a substrate having a plurality of pleats having a length extending from said first end to said second end, the substrate comprising a filter medium having an efficiency when tested with particles having a diameter of 0.01 to 1 μm; (ii) said construction having a tubular shape and defining an open interior having a first and a second opposite ends; and (iii) said substrate at least partially covered by a single layer, said layer comprising a polymeric fine fiber comprising a fiber with a diameter of about 0.01 to 0.5 microns such that after test exposure for a test period of 16 hours to test conditions of 140째 F. air and a relative humidity of 100% retains greater than 30% of the fiber unchanged for filtration purposes, the fine fiber comprising a crosslinked polyvinylalcohol; (b) a first end cap and a second end cap; (i) said media pack being secured to said first end cap at said first end of said media pack; (ii) said media pack being secured to said second end cap at said second end of said media pack; (iii) at least one of said first and second end caps including a sealing portion; said sealing portion comprising a material compressible in a direction toward said media pack. 2. The element of claim 1 wherein the polymeric fiber comprises a polyvinylalcohol having a degree of hydrolysis of about 87-99. 9%. 3. The element of claim 2 wherein the polyvinylalcohol is crosslinked with about 1 to 40 wt. % of a crosslinking agent. 4. The element of claim 1 wherein the polymeric fiber comprises a super hydrolyzed polyvinylalcohol. 5. The element of claim 2 wherein the crosslinked polyvinylalcohol is crosslinked using a polyacrylic acid having a molecular weight of about 1000 to 3000. 6. The element of claim 2 wherein the crosslinked polyvinylalcohol is crosslinked using a melamine-formaldehyde resin having a molecular weight of about 1000 to 3000. 7. The element of claim 1 wherein the polymeric fiber also comprises a resinous additive comprising an oligomer having a molecular weight of about 500 to 3000 and an aromatic character wherein the additive is miscible with the polymer but forms a hydrophobic coating on the fiber. 8. The element of claim 7 wherein the resinous additive comprises an alkyl phenolic aromatic character wherein the additive forms a hydrophobic coating on the fiber. 9. The element of claim 7 wherein the additive comprises an oligomer comprising tertiary butyl phenol. 10. The element of claim 7 wherein the resin comprises an oligomer comprising bis-phenol A. 11. The element of claim 7 wherein the resin comprises an oligomer comprising dihydroxy biphenyl. 12. The element of claim 7 wherein the additive comprises a blend of the resinous additive and a fluoropolymer. 13. The element of claim 7 wherein the additive comprises a fluorocarbon surfactant. 14. The element of claim 7 wherein the additive comprises a nonionic surfactant. 15. The element of claim 7 wherein the polymeric fine fiber comprises a polyurethane polymer.