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A composite filter media structure includes, in an exemplary embodiment, a base substrate that includes a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process. The base substrate has a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-

A composite filter media structure includes, in an exemplary embodiment, a base substrate that includes a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process. The base substrate has a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure A nanofiber layer is deposited on one side of the base substrate. The composite filter media structure has a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure.

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1. A composite filter media structure comprising: a base substrate comprising a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process, said base substrate having a minimum filtration efficiency of about 50% capture of particles having a size of about 0.3 μm to about 0.4

1. A composite filter media structure comprising: a base substrate comprising a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process, said base substrate having a minimum filtration efficiency of about 50% capture of particles having a size of about 0.3 μm to about 0.4 μm, measured in accordance with ASHRAE 52.2-1999 test procedure, said base substrate having a resistance less than about 2.5 mm of water, measured in accordance with EN-1822 (1998), said nonwoven synthetic fabric comprises a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area, each discontinuous line of bond area comprising a plurality of linear lines of bond area arranged end to end with a non bond area between each linear line of bond area; anda nanofiber layer deposited on one side of said base substrate, said composite filter media structure having a minimum filtration efficiency of about 75% capture of particles having a size of about 0.3 μm to about 0.4 μm, measured in accordance with ASHRAE 52.2-1999 test procedure. 2. A composite filter media structure in accordance with claim 1, wherein said base substrate and said nanofiber layer in combination are substantially electrically neutral. 3. A composite filter media structure in accordance with claim 1, wherein said plurality of fibers comprise a plurality of bicomponent fibers comprising a core material and a sheath material, said sheath material having a lower melting point than the core material. 4. A composite filter media structure in accordance with claim 1, wherein said nanofiber layer is formed by electro-blown spinning, electrospinning, centrifugal spinning, or melt blowing. 5. A composite filter media structure in accordance with claim 3, wherein said core material comprises at least one of polyester, polyamide, polyolefin, thermoplastic polyurethane, polyetherimide, polyphenyl ether, polyphenylene sulfide, polysulfone, and aramid. 6. A composite filter media structure in accordance with claim 1, wherein said base substrate has a basis weight of about 100 g/m2 to about 300 g/m2. 7. A composite filter media structure in accordance with claim 1, wherein said nanofiber layer comprises a plurality of nanofibers having an average diameter of about 500 nm or less, said nanofiber layer having a basis weight of about 0.6 g/m2 to about 20 g/m2. 8. A composite filter media structure in accordance with claim 1, wherein said nanofiber layer comprises a plurality of nanofibers having an average diameter of about 500 nm or less, said nanofiber layer having a basis weight of about 1.5 g/m2 to about 2.5 g/m2. 9. A composite filter media structure in accordance with claim 1, wherein said nonwoven synthetic fabric comprises a bond area of said spunbond fibers of about 10% to about 16% of an area of said fabric. 10. A composite filter media structure in accordance with claim 1, wherein said plurality of fibers comprise an average diameter of about 12 to about 25 microns. 11. A composite filter media structure in accordance with claim 1, wherein said composite filter media structure has a resistance less than about 4.0 mm of water, measured in accordance with EN-1822 (1998). 12. A composite filter media structure in accordance with claim 11, wherein a quality factor Qf of said composite filter media structure is greater than about 450. 13. A composite filter media structure in accordance with claim 11, wherein a quality factor Qf of said composite filter media structure is greater than about 500. 14. A filter element comprising a first end cap, a second end cap, and a composite filter media structure, the composite filter media structure comprising: a base substrate comprising a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process, said base substrate having a minimum filtration efficiency of about 50% capture of particles having a size of about 0.3 μm to about 0.4 μm, measured in accordance with ASHRAE 52.2-1999 test procedure, said base substrate having a resistance less than about 2.5 mm of water, measured in accordance with EN-1822 (1998), said nonwoven synthetic fabric comprises a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area, each discontinuous line of bond area comprising a plurality of linear lines of bond area arranged end to end with a non bond area between each linear line of bond area; anda nanofiber layer deposited on one side of said base substrate, said composite filter media structure having a minimum filtration efficiency of about 75% capture of particles having a size of about 0.3 μm to about 0.4 μm, measured in accordance with ASHRAE 52.2-1999 test procedure. 15. A filter element in accordance with claim 14, wherein said base substrate and said nanofiber layer in combination are substantially electrically neutral. 16. A filter element in accordance with claim 14, wherein said plurality of fibers comprise a plurality of bicomponent fibers comprising a core material and a sheath material, said sheath material having a lower melting point than the core material. 17. A filter element in accordance with claim 14, wherein said nanofiber layer is formed by electro-blown spinning, electrospinning, centrifugal spinning, or melt blowing. 18. A filter element in accordance with claim 16, wherein said core material comprises at least one of polyester, polyamide, polyolefin, thermoplastic polyurethane, polyetherimide, polyphenyl ether, polyphenylene sulfide, polysulfone, and aramid. 19. A filter element in accordance with claim 14, wherein said base substrate has a basis weight of about 100 g/m2 to about 300 g/m2. 20. A filter element in accordance with claim 14, wherein said nanofiber layer comprises a plurality of nanofibers having an average diameter of about 500 nm or less, said nanofiber layer having a basis weight of about 0.6 g/m2 to about 20 g/m2. 21. A filter element in accordance with claim 14, wherein said nanofiber layer comprises a plurality of nanofibers having an average diameter of about 500 nm or less, said nanofiber layer having a basis weight of about 1.5 g/m2 to about 2.5 g/m2. 22. A filter element in accordance with claim 14, wherein said nonwoven synthetic fabric comprises a bond area of said spunbond fibers of about 10% to about 16% of an area of said fabric. 23. A filter element in accordance with claim 14, wherein said plurality of fibers comprise an average diameter of about 12 to about 25 microns. 24. A filter element in accordance with claim 14, wherein said composite filter media structure has a resistance less than about 4.0 mm of water, measured in accordance with EN-1822 (1998). 25. A filter element in accordance with claim 24, wherein a quality factor Qf of said composite filter media structure is greater than about 450. 26. A filter element in accordance with claim 14, wherein said composite filter media structure further comprises a plurality of pleats.