Please register or login. There are 0 registered and 1059 anonymous users currently online. Current bandwidth usage: 326.30 kbit/s July 24 - 10:44am EDT 
Hardware Analysis
      
Forums Product Prices
  Contents 
 
 

  Latest Topics 
 

More >>
 

    
 
 

  You Are Here: 
 
/ Forums / Case Modding /
 

  Case fan direction 
 
 Author 
 Date Written 
 Tools 
Continue Reading on Page: 1, 2, 3, Next >>
Matt Wilson Nov 05, 2004, 08:20pm EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List Replies: 43 - Views: 82395
This may seem like a stupid question but I will ask anyway. My case fan didnt come with instructions and I am not sure of the orientation for outward flow. It is the rear case fan. How due you know which way to screw the fan in? Does the side with the wires enter the fan motor go to the outside (toward the case)?


Case: Soyo CX-5959 LAN party
PS: 350W
MB: Soyo P4I865PE Plus
CPU: Celeron 2.7
Ram: To be decided
HD: To be decided
CDRom: Samsung 52x
CD-RW: Samsung 52x32x52x
Video: To be decided
Audio: To be decided
Want to enjoy fewer advertisements and more features? Click here to become a Hardware Analysis registered user.
Josh Nov 05, 2004, 08:29pm EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
If the fan has a sticker, the airflow probably goes from the other side to the side with the sticker. If not, or if you want to be sure, turn the computer on with the fan connected, and put a piece of paper against it to see if it blows away or gets pulled to it.

Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
AMD Phenom 9850 || DFI Lanparty 790FX-M2RS || 8GB OCZ Platinum || XFX 7900GS XT ||
Check eBay computerman_89
David Nov 05, 2004, 08:50pm EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Yep, or some fans have tiny arrows on the edges of the casing pointing the way of the airflow.

David.

_________________

Have a Nice Day :)
Matt Wilson Nov 05, 2004, 09:28pm EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Ok thanks, the arrows are faintly marked.

Case: Soyo CX-5959 LAN party
PS: 350W
MB: Soyo P4I865PE Plus
CPU: Celeron 2.7
Ram: To be decided
HD: To be decided
CDRom: Samsung 52x
CD-RW: Samsung 52x32x52x
Video: To be decided
Audio: To be decided
Matt Lab Nov 06, 2004, 01:06am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
I have 2 fans on my case what direction should I put them in? One inward the other outward? Or both in or out?

CatHair

David Nov 06, 2004, 08:19am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
If you have 2 fans it would be best to have 1 in and 1 out (front in, back out is the norm). Depending on what type of case you have and the locations of the fans you could also try 2 out, but only if you have allot of freeflow ventilation.

David.

_________________

Have a Nice Day :)
Michael A. Nov 06, 2004, 06:19pm EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
As Josh said:

"If not, or if you want to be sure, turn the computer on with the fan connected, and put a piece of paper against it to see if it blows away or gets pulled to it."

Put the fan in the front drawing air in and the fan in the rear pulling air out.

Michael A.
Website: http://itnode.net
bpolo Jan 10, 2005, 09:42am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
I have 2 fan holes on the left cover of my tower, should 1 blow in and 1 blow out or both in or both out.(I already have front blowing in and back blowing out)

Richard Jan 10, 2005, 09:48am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
If you have two fan holes on the side of your case I would put them both blowing air in to the case.



Josh Jan 10, 2005, 10:12am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Yea, definitely, otherwise the air would come in, just to be pulled back out.

Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
AMD Phenom 9850 || DFI Lanparty 790FX-M2RS || 8GB OCZ Platinum || XFX 7900GS XT ||
Check eBay computerman_89
David Jan 10, 2005, 10:15am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Which ever way you have your fans just remember its allways better to be running with a negative pressure inside your case so make sure you have more air comming out that going in.

David.

_________________

Have a Nice Day :)
Sander Sassen Jan 10, 2005, 10:41am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Okay, let me do a little case-fan howto here, as lots of people seem to be confused. Case fans are meant to improve the airflow in a case, but only when really required you should install one. When you do install a case fan, the following points are important.

- Try to generate air flow through the PC, making sure hot components have ample room to breathe
- Move cables and other parts out of the way of these components, creating a clear path
- Air, like electrical current, will always take the route where it encounters the least resistance
- Having a case fan in the front and the back of your case is best, one sucking air in, the other out
- To reduce dust buildup have the top fan blow air in and the bottom fan, in the front, air out
- For many cases a single case fan in the top, blowing air in over the CPU heatsink works fine
- Large, low-rpm casefans, 92 or 120-mm are best, as they're less noisy
- Creating positive pressure inside your case is good, this will keep the dust out
- If dust buildup is an issue, install a fan filter and make sure you have positive pressure inside

Sander Sassen
Editor in Chief - Hardware Analysis
ssassen@hardwareanalysis.com
mothow Jan 10, 2005, 10:45am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List

Edited: Jan 10, 2005, 10:47am EST

 
>> Re: Case fan direction
Hey since heat rises it wouldnt it most likely be better to have all fans blowing in and then cut a hole in the top for a 120mm fan on top taking the hot rising air out.Just a thought but it sounds right has anyone tried this?I just bought a new dremel today and im thinking of put a blow hole in the top of my case ,But i need to go out and get some grills frist.I have the fans already.

Asrock Z97 Extreme 4 / i7 4790K / Corsair H80i / 4x4GB Crucial Ballistix Smart Tracer DDR3 1600 / 1TB Western Digital Caviar Black / 240GB Mushkin Chronos Deluxe SSD / 2x Evga GTX 670 FTW 2GB in SLI / Sound Blaster Recon3D Fatal1ty / Corsair HX1000w
Bob Smith Jan 10, 2005, 10:46am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Just one thing...I disagree with having a top fan blowing in and a bottom fan blowing out. Hot air rises, and so having no extraction method at the top of one's case means the hot air will stay inside.

Sander Sassen Jan 10, 2005, 10:49am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Take it from someone with a MSEE and BSME degree and two patents in semiconductor cooling that I'm right about this one, the natural tendency of heat to rise does not weigh up to the airflow created by the fans.

Sander Sassen
Editor in Chief - Hardware Analysis
ssassen@hardwareanalysis.com
mothow Jan 10, 2005, 10:49am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
LOL thats what i said have the fan on the bottom blowing in and the top one blowing out but i said taking out the hot air.

Asrock Z97 Extreme 4 / i7 4790K / Corsair H80i / 4x4GB Crucial Ballistix Smart Tracer DDR3 1600 / 1TB Western Digital Caviar Black / 240GB Mushkin Chronos Deluxe SSD / 2x Evga GTX 670 FTW 2GB in SLI / Sound Blaster Recon3D Fatal1ty / Corsair HX1000w
mothow Jan 10, 2005, 10:54am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List

Edited: Jan 10, 2005, 11:06am EST

 
>> Re: Case fan direction
No that make's sense Sanders.I just had a thought.But i was just thinking instead of having a good flow to cool everthing just cool the air as much as you can and pull out the heat.But if you say that its better to have a good cross flow. i believe you.You have been at this longer than myself. Plus you have the degree's..lol i dont :-(

Asrock Z97 Extreme 4 / i7 4790K / Corsair H80i / 4x4GB Crucial Ballistix Smart Tracer DDR3 1600 / 1TB Western Digital Caviar Black / 240GB Mushkin Chronos Deluxe SSD / 2x Evga GTX 670 FTW 2GB in SLI / Sound Blaster Recon3D Fatal1ty / Corsair HX1000w
Bob Smith Jan 10, 2005, 10:56am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Well no offence but your qualifications don't mean very much when I have my top fans blowing in and my bottom fans blowing out, and my case temp is higher than I'd like...so I reversed the direction of the fans, bottom in, top out, and my case temp dropped. Just about every high temp prob I've ever seen on other people's computers I've improved the temperatures by making sure it's bottom in - top out.

mothow Jan 10, 2005, 10:59am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List

Edited: Jan 10, 2005, 11:05am EST

 
>> Re: Case fan direction
Sander was just saying that a good open path for the air to stream through is better than what i asked.
The last few days i have been checking out sites like this
http://www.aavidthermalloy.com/products/microp/intel_desktop.shtml
and reading up on their products and spec and designs and things like that trying to come up with a good plan to start working on for a good cooling system. Be water cooling /TEC/ or cold plate what ever.I just wanna do something little differnt

Asrock Z97 Extreme 4 / i7 4790K / Corsair H80i / 4x4GB Crucial Ballistix Smart Tracer DDR3 1600 / 1TB Western Digital Caviar Black / 240GB Mushkin Chronos Deluxe SSD / 2x Evga GTX 670 FTW 2GB in SLI / Sound Blaster Recon3D Fatal1ty / Corsair HX1000w
Bob Smith Jan 10, 2005, 11:02am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List  
>> Re: Case fan direction
Also, if your top fan is at the back, and bottom fan is at the front (which is normal for most cases) why would dust buildup be reduced by the direction? I might be wrong, but I thought dust particles moved with brownian motion. Since the front and back are separated by about a foot and a half (horizontally) of case, I'd have thought the dust atthe back would behave in a way no different to the dust at the front. Also, the vertical difference between the 2 fans at the top and bottom is usually only about 20cm. Now most people's tower is on their desk, and my bottom fan is about a metre off the floor....so I don't think at that height there's going to be a hell of a lot more dust around the top fan than around the bottom.

mothow Jan 10, 2005, 11:12am EST Reply - Quote - Report Abuse
Private Message - Add to Buddy List

Edited: Jan 10, 2005, 11:13am EST

 
>> Re: Case fan direction
well as far as that goes i have dust through out my whole case i have to tear it down from time to time to give it a good cleaning..I have about 10 total fans in my case cpu /north bridge/HDD has a 2 fan cooler on it / videocard fan and a home made PCI slot fan with a 92mm and a80mm fan blowing into my 6800nu And my PSU has a fan sucking hot air out to.So my case gets dusty as hell.I really need some filters on this case.I have one in the front on the 2 fan bringing the air in but i still get dust .The filter kingwin used sucks..lol

Asrock Z97 Extreme 4 / i7 4790K / Corsair H80i / 4x4GB Crucial Ballistix Smart Tracer DDR3 1600 / 1TB Western Digital Caviar Black / 240GB Mushkin Chronos Deluxe SSD / 2x Evga GTX 670 FTW 2GB in SLI / Sound Blaster Recon3D Fatal1ty / Corsair HX1000w

Write a Reply >>

Continue Reading on Page: 1, 2, 3, Next >>

 

    
 
 

  Topic Tools 
 
RSS UpdatesRSS Updates
 

  Related Articles 
 
 

  Newsletter 
 
A weekly newsletter featuring an editorial and a roundup of the latest articles, news and other interesting topics.

Please enter your email address below and click Subscribe.