Interrupted, directional emboss of flat sheet

A filtration system comprising:

• a housing body, the housing body comprising:
• a housing outlet, a housing inlet, and a central compartment;
• and
• a filter element installed in the central compartment, the filter element comprising filter media, the filter media comprising:
• a first sheet of filter media having an upstream inlet adjacent to the housing inlet and a downstream outlet adjacent the housing outlet, and pleated along a plurality of bend lines to form a plurality of wall segments;
• the plurality of wall segments comprising a first set of wall segments alternately sealed to each other at the upstream inlet to define:
• a first set of tetrahedron channels having open upstream ends, and
• a second set of tetrahedron channels interdigitated with the first set of tetrahedron channels and having closed upstream ends;
• the plurality of wall segments comprising a second set of wall segments alternately sealed to each other at the downstream outlet to define:
• a third set of tetrahedron channels having open downstream ends, and
• a fourth set of tetrahedron channels interdigitated with the third set of tetrahedron channels and having closed downstream ends;
• a second sheet of filter media extending across the first sheet of filter media, the second sheet of filter media comprises a plurality of embossments arranged in an interrupted straight line pattern, each of the plurality of embossments forming a raised surface configured to maintain a separation distance between the second sheet of filter media and an adjacent sheet of filter media, the plurality of embossments arranged at an angle Φ with respect to an X-Y axis that defines a plane of the second sheet of filter media, wherein the angle Φ is between 0 and 60 degrees relative to a lateral direction.