A pleated filter element comprising: a pleated filter media comprising a major upstream face and an major downstream face and comprising a plurality of oppositely-facing pleats with a pleat direction and with a plurality of upstream pleat tips and upstream valleys and a plurality of downstream pleat tips and downstream pleat valleys ; wherein the pleated filter media comprises a first corrugated edge and a second corrugated edge ; and, a first noncorrugated edge and a second noncorrugated edge ; wherein the first corrugated edge of the pleated filter media comprises a first edge dam of hardened adhesive that occupies the upstream pleat valleys and the downstream pleat valleys of the pleated filter media at a location laterally inwardly proximate the first corrugated edge of the pleated filter media and that extends along an entire longitudinal extent of the pleated filter media, and wherein the second corrugated edge of the pleated filter media comprises a second edge dam of hardened adhesive that occupies the first-side pleat valleys and the second-side pleat valleys of the pleated filter media at a location laterally inwardly proximate the second corrugated edge of the pleated filter media and that extends along the entire longitudinal extent of the pleated filter media; wherein the pleated filter media is a multilayer filter media comprising a primary filtration layer laminated together with an additional layer, wherein the primary filtration layer comprises an organic polymeric nonwoven web that exhibits a Percent Penetration of less than 5 and wherein the additional layer is a fiberglass prefilter layer that is disposed upstream of the primary filtration layer and that exhibits a Percent Penetration of greater than about 70, and, wherein the first edge dam is a first edge seal that is configured so that the first corrugated edge of the pleated filter media is occluded by the first edge seal, and wherein the second edge dam is a second edge seal that is configured so that the second corrugated edge of the pleated filter media is occluded by the second edge seal. wherein the pleated filter media comprises a first corrugated edge and a second corrugated edge ; and, a first noncorrugated edge and a second noncorrugated edge ; wherein the first corrugated edge of the pleated filter media comprises a first edge dam of hardened adhesive that occupies the upstream pleat valleys and the downstream pleat valleys of the pleated filter media at a location laterally inwardly proximate the first corrugated edge of the pleated filter media and that extends along an entire longitudinal extent of the pleated filter media, and wherein the second corrugated edge of the pleated filter media comprises a second edge dam of hardened adhesive that occupies the first-side pleat valleys and the second-side pleat valleys of the pleated filter media at a location laterally inwardly proximate the second corrugated edge of the pleated filter media and that extends along the entire longitudinal extent of the pleated filter media; wherein the pleated filter media is a multilayer filter media comprising a primary filtration layer laminated together with an additional layer, wherein the primary filtration layer comprises an organic polymeric nonwoven web that exhibits a Percent Penetration of less than 5 and wherein the additional layer is a fiberglass prefilter layer that is disposed upstream of the primary filtration layer and that exhibits a Percent Penetration of greater than about 70, and, wherein the first edge dam is a first edge seal that is configured so that the first corrugated edge of the pleated filter media is occluded by the first edge seal, and wherein the second edge dam is a second edge seal that is configured so that the second corrugated edge of the pleated filter media is occluded by the second edge seal. <EOS>