Just added a small duct to my server, a 1.2ghz Tualatin Celeron. It's allowed me to reduce the PSU fan from 7v to 5v, and the side exhaust fan from about 5v to about 3.5v. Not much of a reduction, but it's made an already extremely quiet machine even quieter.
Machine before:
Cut up part of a manila folder to make the duct:
Duct assembled
Hard disk is a Samsung 200gb soft-mounted with a shoelace. I'd suspend it in free air, but I keep the case mounted vertically in the gap between a desk and a chest of drawers
Couple of notches to allow the duct to fit around the corners of the P3 heatsink
Duct installed
Side view
Other side
Rear view
A little closer
Quick ducting job on my Tualeron server
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