Pip wrote[QUOTE] My monster multi-fanned tower was getting a bit warm around the CPU a couple of weeks ago, when ambient temp first exceeded 10C. It was all fine except the CPU heatsink which was fluffed to buggery. Half a can of compressed air and the CPU temp dropped by 15C. I really ought to find some filters for the fans that don't restrict airflow through them.[/QUOTE] Alfa Romeo air filters.[1] Good down to tiny weeny particulate levels but the next best thing to an open door to air, apparently. [1] As used by a firm called Electronic General Office (EGO) many years ago.