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View Full Version : big exhause fan fetish :)



powerover
04-02-2009, 08:29 AM
At the moment i am trying to build myself a laptop stand with cooling fans.

As you know i love those huge giant fans that comes with some high end pc towers. I was trying to look for those big fans on trademe and some sites in NZ but i was very disappointed. on trademe the biggest they sell is only 140mm, and in some other site the biggest is 200mm (it is called big boy something something), and it is very urgly! :dogeye:

aren't there bigger ones available? like 10 inch (250mm) or something like that? aren't there prettier looking ones, like transparent ones that comes with UV LED?

can anyone please suggest a place or site as to where i can get those big exhaust fans in NZ?

thnks so much for the help.

Blam
04-02-2009, 10:12 AM
It would be INCREDIBLY loud probably, just get the 3 90mm fan ones.

powerover
04-02-2009, 12:37 PM
oh thnks 4 the reply.

but i thought big fans run much slower than the small fans therefore they are quieter..or am i wrong?

Speedy Gonzales
04-02-2009, 12:43 PM
Why bother, if its just for a laptop

Terry Porritt
04-02-2009, 01:16 PM
but i thought big fans run much slower than the small fans therefore they are quieter..or am i wrong?

A big fan does not necessarily run slower than a small fan, it depends on what it is designed for.
However if you are satisfied with the flow rate of a high speed small fan, then the bigger fan can be slowed down to give that same flow and the noise level will be much reduced.

Roughly the flow rate Q is proportional to speed times tip Diameter cubed, so if you have a fan of twice the diameter, say 180mm instead of 90mm, for the same flow the bigger fan need only run at 1/8 the speed of the smaller fan.

Noise level is not so easy to scale:

http://www.mne.psu.edu/lamancusa/me458/11_fan.pdf

powerover
04-02-2009, 01:41 PM
However if you are satisfied with the flow rate of a high speed small fan, then the bigger fan can be slowed down to give that same flow and the noise level will be much reduced.




that is what im talking about, and 1 on the reason i wanted a big fan.

but I still don't know where can I get fans like that in NZ....

Terry Porritt
04-02-2009, 01:54 PM
200mm is going to be the biggest computer fan you'll get with a 12volt DC supply AFAIK.

http://www.pp.co.nz/products.php?pp_id=AA10045

Otherwise you will be into mains powered domestic ventilation fans.

powerover
04-02-2009, 02:18 PM
oh....disappointed....but thanks so much for your help! :thumbs:

cheers.

qazwsxokmijn
04-02-2009, 02:36 PM
Antec uses the 'Super Big Boy' fans which are clear 25cm fans with LEDs for the Skeleton case. Though I've never seen it being sold separately.

Chilling_Silence
04-02-2009, 03:14 PM
So you're after something like this?
http://www.ubergizmo.com/15/archives/2007/12/digital_cowboy_crf102_notebook_cooler.html

I use ones you can get from the Warehouse for approx $35, they're in a square container with tiny feet on either side. Works brilliant for my desktop :D

powerover
04-02-2009, 03:54 PM
So you're after something like this?
http://www.ubergizmo.com/15/archives/2007/12/digital_cowboy_crf102_notebook_cooler.html

I use ones you can get from the Warehouse for approx $35, they're in a square container with tiny feet on either side. Works brilliant for my desktop :D

thnks chilling silence! that is exactly what i am after, but just the fan, not the stand. Im a DIY man and i wanted to build the stand myself. you said they sell that in the warehouse for $35? that is a bit too good to be true..or did i misunderstand you?

Chilling_Silence
04-02-2009, 04:40 PM
Yeah, these are BIG-as fans though, like 30CM+
I'll take a photo of the box tonight, I bought two ...

Unfortunately they require hooking up to mains, but if you're a tinkerer then you might be able to have some fun with USB powering ;)

powerover
04-02-2009, 08:33 PM
Thnks chilling silence, waiting 4 ya photos. :) :thumbs:

hueybot3000
04-02-2009, 10:04 PM
what about a car radiator fan? they run on fairly low volts so i believe

Chilling_Silence
04-02-2009, 11:11 PM
Not sure if anything like this is what you're after, but I bet ya it'll keep more than just your laptop cool! ;)

Attached file: photo1233742142.jpg (http://www.imagef1.net.nz/files/photo1233742142.jpg) (75 KB)

Attached file: photo_(1)1233742168.jpg (http://www.imagef1.net.nz/files/photo_(1)1233742168.jpg) (148 KB)

powerover
05-02-2009, 07:45 AM
LOL that fan is way too thick LOL, right diameter though. :D

I think what I want is not available in the market, so I will have to use our university's CNC machine to make one of those big but thin fans, so I can put it in my laptop stance.

I currently have a wooden one with 4 fans, but I wanted a better looking one. how do I put pictures on? I will take a photo and show you. :D

thnks chilling silence, and everyone who helped. :thumbs:

Blam
05-02-2009, 11:06 AM
When you post a reply, scroll down and click "Manage Attachments"
Then select the picture

SolMiester
05-02-2009, 12:48 PM
It would be INCREDIBLY loud probably, just get the 3 90mm fan ones.

You have that around the wrong way, the bigger they are, the less speed required to move the air, hence less noisey motors....

powerover
05-02-2009, 01:15 PM
You have that around the wrong way, the bigger they are, the less speed required to move the air, hence less noisey motors....

exactly the point, that is why I wanted big fans :D

Agent_24
05-02-2009, 02:03 PM
A bigger fan can move the same amount of air as a smaller one, at a slower speed and hence with less noise.

However, if you want more air moved than a smaller fan then you may get an increase in noise

Blam
05-02-2009, 04:51 PM
I kinda thought he would run it at a fast speed-I originallly thought he wanted his laptop ULTRA cool not that there would be no noise....