I have a Compaq SR1630IL. I recently cleaned my CPU by removing all the air coolers and stuffs and i replaced it. But while replacing them, i didn't know the correct air circulation direction. Mine has 2 coolers, one attached above the processor and the another one to the back of the CPU case. I think i have the cooler above the processor fixed correctly; it takes air into the processor. I need to know about the one fixed to the back of the CPU case. Does it take air inside to the CPU casing or outside to the world?
More aboutcoolers direction
you can have them in any config you want, but generally the front-bottom fans would be intakes (if there are any) and the top-rear fans would be exhausts.