question about ducting.

[Lt. Max]

soon my friend b gettin a 120mm 131 cfm fan and ax-7, he wants to make a duct form side of case to blow onto the heatsink. what material should i make it out of ? should it shrink down to the 80mm size of ax-7 or the widht of duct should stay 120mm?
and should the fan b on heatsink , or on side of case(to blow air in) i dont think it will make a huge diff cause of the cfm size.. mab even side of case better cause then less resistance right?

just had another Q, is ax-7 designed for only an 80mm fan on TOP of it? if so mab its not a good idea to get that heatsink for that purpose..

 

[Arkaine23]

duct

Mount it on the side of the case. You don't want extra weight and leverage stressing the cpu socket.

I'd shrink it down to 100mm or 90mm... that way air is blowing on the area around the socket too.

I made my duct out of rubber, but then I found the perfect thing at a hardware store for a 92mm to 60mm. A cdr/rw spindle would be just the right size for a 120mm duct, though it hardly has any shrinkage. I wouldn't think that'd matter much though, might even be better.

 

[Lt. Max]

ic, well out of rubber.. the duct, does the rubber hold in place? doesnt it sag? :| how did u make it?

but ax-7 design looks like it has to have air comin right onto it not sides or it will screw up its airflow :|

 

[AZZKICKER]

wouldnt it be better if for say u had a fan blowing in from the side through a duct blowing onto the sink and the have a duct 2 the back of the case sucking out

should creat mad turbulance and be more efficant and also wont heat up the case

 

[Arkaine23]

my duct

Its a pvc pipe adapter... goes from 4 inch to 3 inch. I just stretched it a bit to fit it on my 92mm fan and then siliconed it in place. $5.
No work involved at all really. But then I chrome-painted the inside and stuck a bright blue LED in there so it would light up the blowhole. hehehe. Its pretty rigid, with 6mm thick walls, but still flexible. It also dampens the fan's vibration.

Too bad the Glaciator 2 has a top covering which blocks airflow (its fan is mounted inside). If it was just bare fins, it'd work better with the duct. As it is, I had to keep the Glaciator's fan in addition to the duct's fan. Dropped my cpu temp 2C though!

A cd spindle or two might work pretty well for a 120mm fan. Like you could make a velocity stack with two of them... so that it gets narrow in the middle and wide on both ends. Or maybe a fountain drink cup from a convenience store would work well if you cut it up a bit... I just scrounged and tested a couple of simple designs until I found one that worked well.

I'd make an exhaust duct for the rear fan, but its already a 53 cfm'er, and the psu has a 92mm (internal on the bottom that sucks up hot air) and 80mm exhaust as well (modded to go full speed). So I think air exits the back of my case pretty fast already.

 

[Lt. Max]

hmm. ok .
ill see what we come up with

thx

 

[Soloithz]

Try this one out..

I used a side port ducted right over the hsf fan. I have a volcano 7 which uses 80mm fan. I used a speaker box port (3") that you can get at any car stereo shop or even radio shack maybe. I also used some slef adhesive foam tape, the kind they use for sealing up a/c units in your window. I used the foam tape to butt the end of the port to the fan grill and keep it air tight. This way only outside cool air gets sucked in through the fan. Personally I think making the duct larger than the fan to cool off the socket is a waste of time. Unless of course you are using another fan on the outside of the duct to blow air in then it may help a bit. I dont sue a fan on the outside of the port for 2 reasons: 1)It creates mroe noise and 2) The added benefit is not significant enough to warrant the extra noise. After all the hsf fan is only 3 inches form the case door. I have a t-bird 1.4 [email protected] vcore=1.850 volts. with a volcano 7 hsf, arctic silver 2, and an msi k7t pro2-ru MB. My duct method dropped my cpu temp a whopping 15 degrees F! It idles at 40C now and with the vcore down to 1.775 it drops to 36C. Just another tidbit, the cooler the core, the cooler the case. This duct also dropped my case temps. Email me if you want pics of my duct. Peace out.

 

[jagermorder]

ghetto style duct

I don't know if this will help you or not, probably won't, but you never know. I just recently got the idea to put a duct to my cpu, but I live in the middle of nowhere and a trip to town just isn't justified to me. So anyways, I took an old stretched out sock, about three feet of fencing/bailing wire, a empty soda can, and some trusty duct tape. I cut the sock from at the ankle at the ankle and set the resulting tube aside. Then I took the wire and wrapped it tightly around my soda can. I duct taped the two end pieces together so it wouldn't come undone. Then I stuck the can with the wire around it into the sock tube, and took out the can. The wire then expanded, stretched and stretched the sock out to its maximum diameter. Then I duct taped one end of the sock onto the spring that was inside to keep the sock from fraying and to secure the spring inside of it. The other end I stretched around a Delta80 and proceeded to duct tape it securely. After that I started wrapping duct tape around my sock/wire tube to make it airtight. I figured I would lose air through the already stretched out cloth. Then attached the fan to the side of the case, which I am sure I do not need to go into any detail about, and stuck the other end over my POS socket a hsf, the diameter of my duct was larger then my hsf, so air also blows down on the immediate area around my socket. I don't currently have a digital camera or I would give everyone a pic.




T-Bird 1ghz
ABIT KT7A
512MB RAM
40GB DiamondMax Plus
SBLive! Platinum
Geforce2 GTS 32MB

Celeron [email protected] stock hsf
AMP-A+ MB
256MB
20GB WesternDigital
SBLive!
Voodoo3 3000 AGP

 

[Fraggle]

WOW!!! I'd luv to see pix of the old sock duct!!!
I'm doing my duct a bit different. 3in pvc kinda stuff (much thinner and lighter tho, like rain gutter material) mounted on a fan, this ones on the back of my case (I have a QWin 500, big tower)right beside the mobo tray. cap the top, cut a hole pointing at my hsf and let 'er rip. nice thing is I don't have to run the duct fan if I'm not doing anything, because my duct doesn't cover the cpu fan. just forced air intake if I want it

 

[Arkaine23]

ducts

Gotta love that sock duct! This thread should be renamed to "Ducting- MacGuyver Style"