I've used high pressure air (150 - 200 psi) directly from an air compressor quite a bit... I did so reluctantly and on old hardware at first, (I was worried about static too) - but I've never had an issue. Its amazing how much dust you can dislodge from the insides of a power supply with high pressure and large volumes of air. If you don't have an air compressor, I would go with the small air tank that you could fill at gas stations. Or, if you are really tricky, you can refill the compressed air cans with a good rubber tipped nozzle from a air compressor. -- **************************** Daniel Armbrust Biomedical Informatics Mayo Clinic Rochester daniel.armbrust(at)mayo.edu http://informatics.mayo.edu/