A filtration media pack (301, 302, 402, 502, 602) comprising: (a) a plurality of layers of single facer media (5, 117, 137, 147) wherein the layers of single facer media comprise a fluted sheet (3, 43, 70, 80, 90, 112, 122, 142), a facing sheet (4, 44, 72, 73, 82, 83, 92, 93, 111, 113, 121, 123, 141, 143), and a plurality of flutes (11, 15) extending between the fluted sheet and the facing sheet and having a flute length extending from a first face (304, 414) of the filtration media pack to a second face (306, 416) of the filtration media pack, wherein the fluted sheet comprises repeating internal peaks (114, 116, 124, 144) facing toward the facing sheet and repeating external peaks (115, 119, 125, 145) facing away from the facing sheet, and wherein the media length defines an arcuate media length for a flute over a distance defining a period length or interval of a media construction; (b) a first portion of the plurality of flutes being closed to unfiltered fluid flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes being closed to unfiltered fluid flowing out of the second portion of the plurality of flutes so that fluid passing into one of the first face or the second face of the media pack and out the other of the first face or the second face of the media pack passes through media to provide filtration of the fluid; characterized in that (c) wherein the filtration media pack has an asymmetric volume arrangement such that a difference between an upstream volume of the media pack and a downstream volume of the media pack is greater than 10%, (d) wherein the fluted sheet includes at least two ridges (128, 129) extending along at least a portion of the length of the flute, between the internal peak and the external peak, and the media includes four ridges along the media length; and; e) the filtration media pack has flutes having a media-cord percentage of 7.0 % to 16 %, wherein the media-cord percentage is ((1/2 x media length - cord length) / cord length) x 100, wherein the cord length refers to the straight line distance from the center point of the internal peak and the center point of the external peak. (a) a plurality of layers of single facer media (5, 117, 137, 147) wherein the layers of single facer media comprise a fluted sheet (3, 43, 70, 80, 90, 112, 122, 142), a facing sheet (4, 44, 72, 73, 82, 83, 92, 93, 111, 113, 121, 123, 141, 143), and a plurality of flutes (11, 15) extending between the fluted sheet and the facing sheet and having a flute length extending from a first face (304, 414) of the filtration media pack to a second face (306, 416) of the filtration media pack, wherein the fluted sheet comprises repeating internal peaks (114, 116, 124, 144) facing toward the facing sheet and repeating external peaks (115, 119, 125, 145) facing away from the facing sheet, and wherein the media length defines an arcuate media length for a flute over a distance defining a period length or interval of a media construction; (b) a first portion of the plurality of flutes being closed to unfiltered fluid flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes being closed to unfiltered fluid flowing out of the second portion of the plurality of flutes so that fluid passing into one of the first face or the second face of the media pack and out the other of the first face or the second face of the media pack passes through media to provide filtration of the fluid; characterized in that (c) wherein the filtration media pack has an asymmetric volume arrangement such that a difference between an upstream volume of the media pack and a downstream volume of the media pack is greater than 10%, (d) wherein the fluted sheet includes at least two ridges (128, 129) extending along at least a portion of the length of the flute, between the internal peak and the external peak, and the media includes four ridges along the media length; and; e) the filtration media pack has flutes having a media-cord percentage of 7.0 % to 16 %, wherein the media-cord percentage is ((1/2 x media length - cord length) / cord length) x 100, wherein the cord length refers to the straight line distance from the center point of the internal peak and the center point of the external peak.