Positive Pressure Fan Arrangement

Pgh · Post by **Pgh** » Fri Oct 17, 2003 10:59 am

Positive Pressure Fan Arrangement

My case has two 120mm Papst fans, an intake in front and an exhaust in back. I also have a couple of low noise Papst 80mm fans that I'm not currently using.

I was thinking about doing the following:

1. Turning the 120mm fan on the back around so that it blows in.
2. Modding the side panel and mounting the 80mm fans to blow in on the AGP and PCI slots
3. Cutting a 120mm blowhole in top and mounting a grill but no fan.
4. Running all the fans at 5 or 7 volts using a fanbus.

This case has a fanless ProSilence PSU and the video card is a fanless Radeon 9000 AGP.

I thought I would try this using "temporary prototype" cardboard side and top panels before I did any metal cutting.

Can anyone think of a reason, with respect to cooling performance, why this fan arrangement wouldn't be a good idea?

mrzed · Post by **mrzed** » Fri Oct 17, 2003 12:41 pm

I'm not an engineer myself, but I do know that the engineers with the most at stake are all pushing case designs with 1 or 2 large fans exhausting out the top rear, and no intake fans. These are of course the same people trying to push 4 Ghz 120W CPU's to average users who don't need the power and won't put up with the noise.

Methinks they are going to find the most efficient and relatively quiet basic design available.