John D. Penberthy wrote:

> I have a large tower system with several (3) Hard Drives & (2) CD-Roms,
> along with an internal Zip Drive.  As you can imagine I should install a
> second, (actually third fan), towards the top of the case.
>
> Should the fan blow onto the devices, or be directed outward to pull hot air
> away from the devices?

A combination would be ideal. let's say a fan blowing in at the front bottom and
a fan extracting at the top, preferably underneath the power supply.

HTH

Jose