An air filter cartridge comprising: (a) a filter media pack having upstream and downstream opposite flow faces (324, 326) and first and second opposite sides (328, 329) extending between the upstream and downstream opposite flow faces (324, 326); (i) the filter media pack comprises a stack of strips of single facer filter media material, each strip including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the upstream and downstream flow faces (324, 326); (ii) the upstream flow face and downstream flow face are parallel, flat and planar, and each strip of the media pack is angled relative to a horizontal surface from the upstream flow face to the downstream flow face at an angle of 20-80 degrees; (b) a first side panel against the first side of the media pack; and (c) a gasket arrangement including: (i) a perimeter gasket member against the downstream flow face and around a perimeter of the downstream flow face; and (ii) a side gasket member, integral with the perimeter gasket member, and adjacent to at least a partial extension of the first side panel; the side gasket member being at the same angle relative to the downstream flow face as the first side panel at an angle of 20-80 degrees.. (a) a filter media pack having upstream and downstream opposite flow faces (324, 326) and first and second opposite sides (328, 329) extending between the upstream and downstream opposite flow faces (324, 326); (i) the filter media pack comprises a stack of strips of single facer filter media material, each strip including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the upstream and downstream flow faces (324, 326); (ii) the upstream flow face and downstream flow face are parallel, flat and planar, and each strip of the media pack is angled relative to a horizontal surface from the upstream flow face to the downstream flow face at an angle of 20-80 degrees; (i) the filter media pack comprises a stack of strips of single facer filter media material, each strip including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the upstream and downstream flow faces (324, 326); (ii) the upstream flow face and downstream flow face are parallel, flat and planar, and each strip of the media pack is angled relative to a horizontal surface from the upstream flow face to the downstream flow face at an angle of 20-80 degrees; (b) a first side panel against the first side of the media pack; and (c) a gasket arrangement including: (i) a perimeter gasket member against the downstream flow face and around a perimeter of the downstream flow face; and (ii) a side gasket member, integral with the perimeter gasket member, and adjacent to at least a partial extension of the first side panel; the side gasket member being at the same angle relative to the downstream flow face as the first side panel at an angle of 20-80 degrees.. (i) a perimeter gasket member against the downstream flow face and around a perimeter of the downstream flow face; and (ii) a side gasket member, integral with the perimeter gasket member, and adjacent to at least a partial extension of the first side panel; the side gasket member being at the same angle relative to the downstream flow face as the first side panel at an angle of 20-80 degrees..