I just received my Metro Vacuum ED500 DataVac and blew out one of the old Dell machines. Temps were 50-51 C before cleaning. Temps are 34-35 C after. I will never touch another expensive can of air. I highly recommend this item for cleaning.
Be careful when buying. On Amazon there is another model that is more expensive but is the exact same thing (according to reviews). I paid $51 shipped.