I wonder how many of you would actually use sound dampening material to lower the overall noise coming from the casing?

I have a casing of which all the fans already at their minimal spindle speed but still generate noise when the environment is quiet, well it's at my bed room and only couple of meters away from my bed so it could get annoying if I turn off my desk fan (yes, my desk fan actually louder) when the weather getting cold.

I was thinking of purchasing those acoustic foam but it's quite expensive.

Anyone using other material? Cheap and practical, I'm a serious cheap-stake
Will polyfoam works the same? I kinda have plenty of them around, even the compressed one

Thank you all...

Oh, you can discuss here as well.

This post has been edited by wildwestgoh: Mar 8 2013, 04:19 PM

Polyfoam won't work as it not absorb the sound well. But still worth to try as it's free..
Try ask from car accessories shop for sound dampening mat. Pick most thinner (1/4 - 1/2 inch). Maybe can got more cheaper compare from computer shop.

To minimized fan humming sound, do not obstruct airflow with thick filter or smaller fan grill holes. Better if direct opening. Put rubber washer for each screw. That how I do...

Not sure if there are new products on the market, but back then we used to use these:
http://www.dansdata.com/foam.htm

for me, I just use soft foam to prevent any vibration.