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Duct fan mod, got this idea from this board

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platinumike

Platinum Member
I got this idea from a link somoene posted a while back on here, My proccessor(palomino xp2100) used to run at 63-64*c idle. Now it runs at 40-45*c. Made a huge difference, and looks cool nonetheless. I warned you that the pics were taken on my cellphone, and my bro has my digital cam. Thanks for looking!

http://www.angelfire.com/un/picsfl/mod.html
 
Glad to see you tried Sentinel's foam board mod, and I'm encouraged by your results.

I'm trying to capture additional fresh air for the CPU intake from a filtered blowhole, while allowing for the "serial" augmentation of fans that John Cinnamon -- Sentinel's inspiration -- posted on his mod. I need to open up my intake duct behind the filter, to draw clean air from inside the case.

I already purchased my $5 foam-board panel, and bought $16 worth of clear Lexan because I wasn't sure with which material I'd be better satisfied.

Here's my minor problem. I want to keep the 120mm blow-hole duct that mates up with the side-panel on one end and the CPU fan on the other. That takes up some space inside the system.

The other minor problem -- these mods all seem to utilize two 80 or 92mm exhaust fans arrayed vertically down the back side of a tower case. In my tower case, I installed them horizontally -- two twin 92's. Therefore, the fan-orientation is perpendicular to the plane of the flat-panel mobo-duct/cover, but I CAN make it work. But once I do, I'm afraid it will be cumbersome to remove the duct anytime I want to diddle with the mobo or fix something.

Anyway, I'm just taking my sweet-assed time with this, as I have with everything. If I'd known about the effectiveness of this type of duct when I started cutting on my recycled-full-tower case a year ago, I would have made a special effort to be more daring about how the fans were installed, or I might have dared to make cuts so the two 92's would instead have been a single 120mm.

But here's an observation. Because my blow-hole duct is isolated, and the blow-hole is filtered with an Ultra filter, I discovered that the new 125 CFM CPU fan I installed was not really pushing 125 CFM -- if you know what I mean -- because of the filter. Sentinel and Cinnamon are absolutely correct -- this is all about balancing air pressures between various intake ports and exhaust ports. I can actually tune down my front intake fans and tune up my exhaust fans, and the throughput of the CPU filtered blowhole increases, giving me a drop of 1 to 2F in the CPU temperature. And that's before I have even started with the foam-board mod, or putting behind-the-filter louvers in my blow-hole duct!!
 
Nice job on the mod. I did the same mod on my Antec case last night. The case temp went down from 36C to 26C while CPU went down from 56C to 52C. No foam board yet though. Just went with plain cardboard. While I was at it I added a (ghetto 2liter soda bottle) duct onto the cpu fan, cut to draw in air from front fans; and a ramp (another card board) on top of pci cards to direct air flow from front fans to vid card. Only downside to all this I noticed that the noise level went up a little bit. More testing and benchmarking to follow.

Just for reference: http://overclockers.com/tips1187/index02.asp
I think this is where idea originated from.
 
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