Forcing Air Into A Side-Mount Intake Fan - AVS Forum
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post #1 of 17 Old 07-06-2014, 09:59 AM - Thread Starter
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Forcing Air Into A Side-Mount Intake Fan

Hey everyone,

With summer being here in Washington DC, the ambient temp in the room where in which my server resides is always pretty warm (70's to lower 80's).

In order to increase airflow to my case, I thought it might be a good idea to place a little desktop/personal fan right up against the side-intake fan, like this:


http://1drv.ms/1jcOHBz





So the question I have is this - Good idea or bad idea to place a fan up against my case's side-mount intake fan?

Thanks!

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post #2 of 17 Old 07-06-2014, 10:22 AM
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Why not just mount a case fan to the opening instead? It will probably do a better job since it would be drawing air in through the opening rather than trying to force it in.
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post #3 of 17 Old 07-06-2014, 10:43 AM
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Stacked fans typically require guide vanes between them to maintain the effectiveness of both fans, else they just interfere with each other. If your external blower is strong enough, you're better off removing the internal fan entirely to get it out of the flow. If it's not strong enough, it's just creating turbulence in for the internal's intake, reducing its suction.


http://www.ebmpapst-ad.com/media/con...d-parallel.pdf

...but testing trumps theory. Try it all three ways with your pc under load and check the cpu & mobo temps.

Last edited by EricN; 07-06-2014 at 10:46 AM.
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post #4 of 17 Old 07-06-2014, 12:45 PM
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I don't think it will make much of a difference. What are your temps like?
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post #5 of 17 Old 07-06-2014, 01:14 PM
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Quote:
Originally Posted by EricN View Post
Stacked fans typically require guide vanes between them to maintain the effectiveness of both fans, else they just interfere with each other. If your external blower is strong enough, you're better off removing the internal fan entirely to get it out of the flow. If it's not strong enough, it's just creating turbulence in for the internal's intake, reducing its suction.


http://www.ebmpapst-ad.com/media/con...d-parallel.pdf

...but testing trumps theory. Try it all three ways with your pc under load and check the cpu & mobo temps.
Did you look at the photo he posted? There's no internal fan mounted on the side panel.
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post #6 of 17 Old 07-06-2014, 01:16 PM
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It looks like there is a white fan mounted.
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post #7 of 17 Old 07-06-2014, 01:23 PM
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Quote:
Originally Posted by Mrkazador View Post
It looks like there is a white fan mounted.
I just looked at it again and you could be right. I had to blow up the image to see it, and even then it's not really all that obvious. If there is an internal fan then adding the external fan isn't going to gain much in the way of increased cooling. Besides, if the ambient temperature is high then the air entering the PC case is also going to be warm and thereby reduce the overall cooling effect.
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post #8 of 17 Old 07-07-2014, 07:45 AM - Thread Starter
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Quote:
Originally Posted by Mrkazador View Post
I don't think it will make much of a difference. What are your temps like?
Thx! The temps are, while at idle:

CPU: 36c (~96f)


MB: 37c (~97f)


What does everyone think, kinda on the high side?


CPU is a AMD FX-8150 and board is an Asus Sabretooth 990-FX (I know overkill for a media server, but it was initially going to be a gaming box, but I switched it over to a file server/media server/virtual host).

Case:Fractal Design Node 605
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post #9 of 17 Old 07-07-2014, 07:46 AM - Thread Starter
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Quote:
Originally Posted by Mrkazador View Post
I don't think it will make much of a difference. What are your temps like?
Quote:
Originally Posted by captain_video View Post
I just looked at it again and you could be right. I had to blow up the image to see it, and even then it's not really all that obvious. If there is an internal fan then adding the external fan isn't going to gain much in the way of increased cooling. Besides, if the ambient temperature is high then the air entering the PC case is also going to be warm and thereby reduce the overall cooling effect.
Yes, there's a 120mm side mount fan installed, in intake mode.


Good point on the warm ambient-air theory, I didn't think of that...

Case:Fractal Design Node 605
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Software:WMC8+LAV+madVR+MPC-HC
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post #10 of 17 Old 07-07-2014, 08:34 AM
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Those temps are fine, I wouldn't worry about it. That fan isn't doing much, at best it could do nothing and at worst it could possibly overdrive the fan past its standard RPM and kill it quicker than normal. You're better off sticking fans in the front if you can and making sure you have good exhaust out the back or top.
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post #11 of 17 Old 07-07-2014, 08:45 AM
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Quote:
Originally Posted by Bizzy G.L.X. View Post
Thx! The temps are, while at idle:
CPU: 36c (~96f)
MB: 37c (~97f)
What are the temps while under load? That's what matters.
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post #12 of 17 Old 07-07-2014, 08:54 AM - Thread Starter
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Quote:
Originally Posted by pylor View Post
Those temps are fine, I wouldn't worry about it. That fan isn't doing much, at best it could do nothing and at worst it could possibly overdrive the fan past its standard RPM and kill it quicker than normal. You're better off sticking fans in the front if you can and making sure you have good exhaust out the back or top.

Cool, thanks for the advice on the temps. I'll remove the little desktop fan I have blowing into the side intake then.


Also, yes, I have two 140mm intake fans in the front of the case, blowing air right onto the drive array.


There are two 140mm exhaust fans at the top of the case and one 140mm exhaust fan at the read of the case.

Case:Fractal Design Node 605
APU:AMD Richland A10-6700
RAM:8GB AMD 1866
Board:ASUS A88XM Plus
Storage:OCZ 256 GB Vector
Optical:Panasonic Slim BDR
PS:Silverstone Strider 550 Gold SFF
Software:WMC8+LAV+madVR+MPC-HC
Input:Logitech K400 mini KB/trackpad+Harmony 720
Output:Sammy 55" S6 LED LCD+Yamaha soundbar
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post #13 of 17 Old 07-07-2014, 08:55 AM - Thread Starter
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Quote:
Originally Posted by EricN View Post
What are the temps while under load? That's what matters.

Good question...I'll crank up a bunch of backups and see how the temps look...


Here's a little load test I performed last night, running all three of these tasks at once:


1) Backing up 20 GB of content from the server's internal array to an external USB3 drive


2) Unzipping 20 GB of compressed content via 7-Zip x64. The compressed content was stored on the server's internal array and was unzipped to an internal SSD


3) Ripping & encoding, via Handbrake, the Disney WOW BD-ROM from the server's optical drive to the server's internal array


CPU temperature climbed to, and hovered around, 48c and motherboard temp climbed to, and hovered around, 36c.


I'm comfortable with those temps, however would anyone else watching this thread not be comfortable with those temps?

Case:Fractal Design Node 605
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Board:ASUS A88XM Plus
Storage:OCZ 256 GB Vector
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Software:WMC8+LAV+madVR+MPC-HC
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Last edited by Bizzy G.L.X.; 07-08-2014 at 07:33 AM.
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post #14 of 17 Old 07-07-2014, 09:43 AM
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Quote:
Originally Posted by Bizzy G.L.X. View Post
Good question...I'll crank up a bunch of backups and see how the temps look...
Running the Prime95 torture test (http://www.mersenne.org/download/) will give you the worst-case cpu temperature pretty quickly.
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post #15 of 17 Old 07-07-2014, 10:18 AM
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One thing to remember, we feel temperature differently than machines.

Our perception is affected by humidity, theirs is not (as long as it is not condensing and causing shorts). That is why to us 90°F in Arizona feels cooler than 90°F in Houston.

So, when your room is at 80°F and 90% humidity, you will feel that is very hot in there (probably feel like it is 95°F), but the computer will only "feel" 80°F.

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post #16 of 17 Old 07-07-2014, 12:02 PM
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Originally Posted by blueiedgod View Post
One thing to remember, we feel temperature differently than machines.

Our perception is affected by humidity, theirs is not (as long as it is not condensing and causing shorts). That is why to us 90°F in Arizona feels cooler than 90°F in Houston.

So, when your room is at 80°F and 90% humidity, you will feel that is very hot in there (probably feel like it is 95°F), but the computer will only "feel" 80°F.
No, electronics "feel" it too. As the humidity rises the thermal conductivity of air drops, which reduces the efficacy of forced-air convection cooling. At the same ambient temp, a PC in humid air will run hotter than a PC in dry air.

http://www.electronics-cooling.com/2...-of-moist-air/
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post #17 of 17 Old 07-08-2014, 07:23 AM - Thread Starter
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Quote:
Originally Posted by EricN View Post
Running the Prime95 torture test (http://www.mersenne.org/download/) will give you the worst-case cpu temperature pretty quickly.
Coolio, thx for the heads up on Prime95 (I totally forgot about this util...)

Case:Fractal Design Node 605
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RAM:8GB AMD 1866
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Software:WMC8+LAV+madVR+MPC-HC
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