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Fan at end of duct?

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Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
I have seen both designs, one with just a duct from heat sink fan to outside air (no fan at end of duct pushing air to heatsink fan) and I've seen the duct with the fan at the end (besides the heatsink fan). Which is better? I'm thinking about just putting an 80mm to push some air towards the heatsink. What do you suggest/advise?
 

trdsw20

Member
Joined
Jan 9, 2002
Location
bay area
Assuming that teh HSF blows towrd the HS. it might be a good idea to put a fan at the other end of the duct pushing air towards the HSF. Its important that the HSF can handle that kind of intake. You would want to balance the power and output of each fan into consideration.
just test it and see what kind of results are achieved by doing this. then try it without you should see some decrease or increase of performance!
 

Arkaine23

Captain Random Senior Evil
Joined
Nov 8, 2001
Ducting

Too many variables to predict. Test it out and see which way is better for your particular duct, heatsink, and fans.
 

Yodums

Senior Member
Joined
Oct 5, 2001
Location
Ottawa, Canada
The fan works better. It moves air from the outside cooler (Air moving at a turbulance), and it gets it to the heatsink faster while it's still cool.
 
OP
Garfield

Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
Yeah, that's what I was thinking. My mind is made! Now, how would I go about "sticking" the fan onto the case side? And, are there some fan power supply extensions that you can buy because I'll need enough leway (sp?) to take the case side off and then unplug the power supple to further take it off.
 

Christensen

Member
Joined
Apr 3, 2002
duct fan

If you're using flex duct, you will find that it causes a lot of "turbulance" which decreases the airflow and sometimes increases CPU temp. --not what you would hope for! I've tried this and it works, but not efficiently. An additional fan might help, but agree that balance is important. That's why I'm designing a scoop that uses an existing intake fan's air to feed the HSF. It attaches to the HSF which completely isolates it from the hot heatsink air and other close proximity fans that compete for air with the HSF. I posted this under "air cooling aid" on 4/5 and will do further testing if most of you think I should.
 
Last edited:
OP
Garfield

Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
Sounds like a good idea. But, if I wanted to put the 80mm at the end, I couldn't use that pipe reducer, right? Becuase it wouldn't fit in the reducer, I assume. diehrd, how did you get those fans mounted on the side of your case? Did you just drill holes into the case and screw in the fans with the grills attached at the other ends? Thanks!
 

diehrd

Senior SMP Gawd
Joined
Jan 15, 2001
Location
NY
Garfield said:
Sounds like a good idea. But, if I wanted to put the 80mm at the end, I couldn't use that pipe reducer, right? Becuase it wouldn't fit in the reducer, I assume. diehrd, how did you get those fans mounted on the side of your case? Did you just drill holes into the case and screw in the fans with the grills attached at the other ends? Thanks!

Yep and the ducts are held on with L brackets that attach at the screw holes for my grils.
 
OP
Garfield

Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
diehrd, how did you get the fans to have such long wires!? That's necessary. You have a real nice setup there. Where'd you get all of this?
 

diehrd

Senior SMP Gawd
Joined
Jan 15, 2001
Location
NY
I extended the wires changed the connectors to 4 prong male ends.

I also wired them all into the 1 plug.I needed the plug wire long so I can get the case side on and off easy.
 

diehrd

Senior SMP Gawd
Joined
Jan 15, 2001
Location
NY
I cut and joined the fan wires then used wire from radio shack to lengthen them,see pic
 

diehrd

Senior SMP Gawd
Joined
Jan 15, 2001
Location
NY
Yep just cut them off and wired each wire to the desired length.

Then i put a sprial wire covering on them to get a neat look and to secure the wires to case side
 

AntmanMike

Member
Joined
Nov 13, 2001
Location
Chicago.
Could i take apart a Dehumidifier, and put its refridgeration coils into a duct to chill the air a bit? Technically, right when the air was chilled condensation would occur, so i could make a runoff tube, that way the water wouldnt drip down to the CPU.
 
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Garfield

Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
>> Member of the OADO - Overclockers Against Drunk Overclocking <<

LOL! :D NICE


diehrd, what "material" did you use to extend the fan wires? Just metal wire? Does this spiral wire just cover it, or bring the charge to the fan?
 

diehrd

Senior SMP Gawd
Joined
Jan 15, 2001
Location
NY
I used common colored wire at radio shack .And elec tape.Then covered the wires with sprial conduit.

If you see the length for the plug it is long so I can open the side several inches allowing me to reach in and unplug the fans.And plug them in easy as i install side.
 
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Garfield

Garfield

Member
Joined
Dec 1, 2001
Location
New Jersey
Yeah, I think I'm going to splice the wire to do it. That should work. Thanks and I'll tell you how it goes!