An air filter, comprising: a pleated filter media extending in a machine direction and in a transverse direction substantially perpendicular to said machine direction, said machine direction and said transverse direction define a first plane; said pleated filter media extending in said transverse direction from a top to a bottom; said pleated filter media having a plurality of pleat valleys continuing substantially uninterrupted from said pleated filter media top to said pleated filter media bottom; and a frame having an inner perimeter, a frame front, a frame rear applied with an adhesive that is placed in contact with said pleated filter media, and a plurality of structural support members (152, 155, 156); wherein one or more attachment members (142, 144, 146, 148) of the frame front are attached to one or more attachment members (242, 244, 246, 248) of the frame rear; wherein said plurality of structural support members (152, 155, 156) include a plurality of angled support members angled relative to said transverse direction; and wherein said plurality of structural support members (152, 155, 156) include at least one tensile support member extending substantially parallel to said transverse direction; characterized in that said filter media has an unassembled width in said transverse direction that is wider than a width of said inner perimeter of said frame in said transverse direction, such that said filter media interposed between said frame front and said frame rear creates tension in the frame in said transverse direction, said at least one tensile support member being adapted to receive said tension. a pleated filter media extending in a machine direction and in a transverse direction substantially perpendicular to said machine direction, said machine direction and said transverse direction define a first plane; said pleated filter media extending in said transverse direction from a top to a bottom; said pleated filter media having a plurality of pleat valleys continuing substantially uninterrupted from said pleated filter media top to said pleated filter media bottom; and a transverse direction substantially perpendicular to said machine direction, said machine direction and said transverse direction define a first plane; said pleated filter media extending in said transverse direction from a top to a bottom; said pleated filter media having a plurality of pleat valleys continuing substantially uninterrupted from said pleated filter media top to said pleated filter media bottom; and a frame having an inner perimeter, a frame front, a frame rear applied with an adhesive that is placed in contact with said pleated filter media, and a plurality of structural support members (152, 155, 156); wherein one or more attachment members (142, 144, 146, 148) of the frame front are attached to one or more attachment members (242, 244, 246, 248) of the frame rear; wherein said plurality of structural support members (152, 155, 156) include a plurality of angled support members angled relative to said transverse direction; and wherein said plurality of structural support members (152, 155, 156) include at least one tensile support member extending substantially parallel to said transverse direction; characterized in that said filter media has an unassembled width in said transverse direction that is wider than a width of said inner perimeter of said frame in said transverse direction, such that said filter media interposed between said frame front and said frame rear creates tension in the frame in said transverse direction, said at least one tensile support member being adapted to receive said tension. rear applied with an adhesive that is placed in contact with said pleated filter media, and a plurality of structural support members (152, 155, 156); wherein one or more attachment members (142, 144, 146, 148) of the frame front are attached to one or more attachment members (242, 244, 246, 248) of the frame rear; wherein said plurality of structural support members (152, 155, 156) include a plurality of angled support members angled relative to said transverse direction; and wherein said plurality of structural support members (152, 155, 156) include at least one tensile support member extending substantially parallel to said transverse direction; characterized in that said filter media has an unassembled width in said transverse direction that is wider than a width of said inner perimeter of said frame in said transverse direction, such that said filter media interposed between said frame front and said frame rear creates tension in the frame in said transverse direction, said at least one tensile support member being adapted to receive said tension.