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Only rear exhaust, what kind of fan is best?

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post #1 of 52 (permalink) Old 01-22-2020, 09:30 AM - Thread Starter
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Only rear exhaust, what kind of fan is best?

I recently bought myself a used raid station/case to use for my external drives (http://www.sharkoon.com/product//12916), and it comes with a single rear exhaust fan (upper rear like in most ATX cases). The specific fan that came in it is a Noctua NF-S12 ULN, which is a really good fan for what it is, but I am somewhat curious if as different kind of fan might be a better choice to keep all that spinning rust cool.

So let's pose a question: If you had a simple computer case with the entire front covered in a massive harddrive cage and no option to mount any fans anywhere other than at the upper rear of the case. Which fan would you personally choose for such a task? Static pressure? Air flow focused? thick vs slim? A more balanced approach?

Feel free to make whatever choices you want within the posed requirements (only 1 fan and 120mm size as anything larger won’t physically fit). Personally I would want to keep it under 1000rpm, but feel free to argue anything you want.

Edit: Had to rephrase the question somewhat. I'll also upload internal pictures ones I'm done copying some files on one of the internal drives to show what I have to work with.

Last edited by Rainmaker91; 01-22-2020 at 11:36 AM.
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post #2 of 52 (permalink) Old 01-22-2020, 09:44 AM
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Could always cut out the fan grill on the back and stick with the NF-S12A. The NF-A12x25 will likely be more expensive and it''ll be louder to push as much air as the NF-S12A

I have both types in my case. The NF-A12x25 is noticeably louder.

If you do want to control the fan, find a fan controller that can do voltage control and control the speeds that way

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post #3 of 52 (permalink) Old 01-22-2020, 09:59 AM - Thread Starter
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Quote: Originally Posted by Shawnb99 View Post
Could always cut out the fan grill on the back and stick with the NF-S12A. The NF-A12x25 will likely be more expensive and it''ll be louder to push as much air as the NF-S12A

I have both types in my case. The NF-A12x25 is noticeably louder.

If you do want to control the fan, find a fan controller that can do voltage control and control the speeds that way
I have no issues with modifying it, I'm just curious as to if a static pressure fan would yeild any real benefit over the current setup. As for fan control... there is no need at the moment as the PSU in this thing is so lound that I'm contemplating putting in a 25mm 80mm fan mounted on the outside of the PSU jsut to get it a bit more quiet (it's an SFX supply though so I am also just contemplating swapping it out rather than throwing money on it, as I'm expecting to have to swap out the caps as well).

Still though, what sort of fan is most suited for a case with only a rear fan mount? I'm genuinely curious, because if it only had front mounts I would have slapped in some radiator optimized fans for sure (Eloops, Gentle Typhoons, NF-F12, NF-A12, ML120... and so on).
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post #4 of 52 (permalink) Old 01-22-2020, 10:37 AM
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I would get a strong 120x38 and leave those Noctuas alone
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post #5 of 52 (permalink) Old 01-22-2020, 10:41 AM
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Hi,
None
The entire back of a case is open
If anything remove all pci-e slot covers = boom done.

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post #6 of 52 (permalink) Old 01-22-2020, 11:03 AM
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The rear vents leave little to be desired. Are you able to take temps of the case?

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post #7 of 52 (permalink) Old 01-22-2020, 11:18 AM - Thread Starter
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Quote: Originally Posted by keikei View Post
The rear vents leave little to be desired. Are you able to take temps of the case?
I could try, but do remember that this is ony for cooling harddrive of which I currently have 4 mounted, but the case can take a total of 8 3.5" drives.

Now there is some actual air flow even if it's only a single S12a (actually think it's a s12a ULN) so it's doing something, but I'm still really curious if there would be any benefit to utilizing a high static pressure fan instead of a regular case fan optimised for non obstructive air flow like the S12a. I have some Eloops 1900rpm fans, some ML120s and an old Papst 38mm thick fan laying around (some for future projects, some are just spares). So I can do experimenting, but I'm honestly curious on the communitys take on such a specific use case.

I'll update the original post to be more clear as to what I'm actually asking.
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post #8 of 52 (permalink) Old 01-22-2020, 11:25 AM
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Hi,
Hard drive cages
Only difference would be to add fans directly too each side of the hdd cage
Otherwise fans other places won't do anything.

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post #9 of 52 (permalink) Old 01-22-2020, 11:38 AM
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Single high pressure rated rear fan will move enough air to cool HDD and basic system running them. Keep keep in mind this Sharkoon case is not designed to do anything but being a RAID station.

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post #10 of 52 (permalink) Old 01-22-2020, 11:40 AM
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If you're bored, cut out the rear and mesh it out with no fan. It wont be pretty, but you'd get better airflow.

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