Dust can be a computer system's worst enemy as it has the potential to lower cooling performance or cause damage when left overly accumulated. 120mm aluminum fan filters / screens for 12x12cm case cooling fan. These filters provide maximum airflow with effective filtering. The tightly woven aluminum corrugated mesh screen is encased in a formed aluminum frame built for ruggedness and durability. The units are easily washed in a solvent or degreaser and can be mounted directly to the fan or to a panel.