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Fan filters in a custom PC are there to block dust and other airborne particles from getting into the PC case. Fan filters utilize foam or a fine mesh of metal or plastic to allow air to pass through but stop the unwanted materials. PC components today produce a lot of heat, necessitating improved cooling solutions. Whether cooled by air or water, one way to improve cooling is to increase the heat-dissipating air contact area. In other words, more fins. More fins means less space between the fins, which makes blockage by dust and debris more likely. Many custom PC builders pride themselves on the appearance of their custom systems as well, and use fan filters to help keep the inside of their PC case clean. TITAN RIG has fan filters in multiple colors to match your build, with removable filter media for easy cleaning.