Recirculation filter for an electronic enclosure

A method of making a filter assembly comprising:

• placing a first sheet of filter media between a first mating structure and a second mating structure, wherein the first mating structure defines a perimeter and a cavity recessed from the perimeter and the second mating structure defines a protrusion configured for mating engagement with the cavity;
• compressing the first sheet of filter media between the first mating structure and the second mating structure such that the first sheet of filter media defines and retains a cavity structure and a rim region about the perimeter of the cavity;
• disposing a plurality of adsorbent beads within the cavity of the first sheet of filter media, such that a substantial portion of the plurality of adsorbent beads are unbonded where the plurality of adsorbent beads define an adsorbent face area having an adsorbent density of greater than 600 g/m2;
• and
• coupling a perimeter region of a second sheet of filter media to the rim region to contain the adsorbent beads between the first sheet of filter media and the second sheet of filter media.