Okay people go to the link Gerwin posted and take a look. HDDs won't make noise in that kind of box. And the guy runs with zero fan.
BladeRunner is running with zero fan as well. He's been running that way for a long time now, without any trouble.
So let's get serious. The way to get a truly silent system is NOT to add fans... This is not even an option.
To add some fuel to this, my own system is running with ZERO airflow on the mobo side (i've got a YY cube). That means, zero fan on mobo, RAM, mosfets etc.. The mobo side is at 36°C under load, and 34°C idle. Everything is quite warm, but not burning hot.
South bridge is not hot (NVidia MCP), and RAM isn't as well - Corsair sticks come with heat spreaders installed.
The point is, my mobo side is exposed to ambient air, and convection works well. Some kind of chimney would help a lot indeed.
I've been touching capacitors and mosfets on the mobo - no hot component there.
Now i'm planning to buy a HDD waterblock, since my SCSI disks are the hottest components in my case, and they got small airflow from the PSU (running reverted) and the rad (blowing in the case, HDD side).
In brief: no you don't need any fan. But proper planning and thinking, on how convection can work its best in your system. In my opinion, an insulated case with a silent system is not a good idea. Just insulate HDDs like in the link you posted.
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