On Jun 17 2005, 7:47, Cini, Richard wrote: was with it Don't do that. If it's designed to blow in, changing the direction to blowing out will alter and probably reduce the cooling. Why? Because turbulent air is lots better at cooling than a laminar flow, and will reach more parts of the case. You get turbulent air from the "blow" side of a fan, but laminar flow towards the inlet side. You may also be directing the airflow away fom some component that previously was cooled, eg a PSU. Moreover, if you alter the flow direction so that air is being sucked in through all the other orifices, it will be entering via the fronts of disk drives etc (well, probably not on this machine but I'm thinking of the general case). That's the last place you want the dust. Far better it drops on the motherboard where you can vacuum it out. Better still, fit a filter. -- Pete Peter Turnbull Network Manager University of York