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Extra case fans?

post #1 of 7
Thread Starter 
In planning my rig upgrade I realized I'm going to have several spare 120mm fans off the Corsair H100 as I'm buying better fans for it.

This got me wondering, as the fans will be identical would fixing them together (i.e. back to back so I have a stack of two fans blowing in the same direction) be beneficial or detrimental to the airflow of the case? Would having two fans bolted together provide better airflow or would it just inhibit the flow of the fans compared to a single fan?

I'd love to hear your thoughts as I'll have two extra fans that wouldn't otherwise be used and I'd like to make the best of them. smile.gif

Thanks again. thumb.gif
post #2 of 7
Some sort of push-pull but without anything to cool in-between them? I don't really see how it should be beneficial, because according to my logic; the air that the second attached fan will be pulling into the case will be the air, that the first fan had already pulled towards it. Right?
The second thought I'm having is, that the extra pull created by the second fan attached to the first, will double the pull of the first fan.
I'm leaning most towards my first thought, but I'm no scientist biggrin.gif
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post #3 of 7
Honestly, all you'll get is more fan vibration and turbulence = more noise. If you were stacking Heat Sink fans to provide more air pressure, then that would be ok but there is no real benefit what so ever for case cooling. If you have room, you can fit one of the spare fans in the front 5.25 drive bay, that will help more or just sell them.
post #4 of 7
Thread Starter 
Ah ok, I just thought having two motors pulling the air through might improve the CFM or something.

Also I don't see an easy way of modifying the inside of the HAF-X to accommodate a 120mm fan in addition to the 230mm without ghetto-rigging it so I may just have to see if anyone wants them, I can't imagine the stock Corsair fans would sell for too much.
post #5 of 7

If you already have two case fans, perform an experiment: send power to both, then put them closer and closer together, and feel the output. When I did this I felt output drop to almost nothing. But somebody else mounted a couple of P14's on a heatsink and got better cooling.

 

So all I can say is this: try it.

 

Oh. You could put a fan at the front of your 5.25 bay and another at the back. Nice experiment to try. Will it improve output? You tell us.

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post #6 of 7
Quote:
Originally Posted by ehume View Post

If you already have two case fans, perform an experiment: send power to both, then put them closer and closer together, and feel the output. When I did this I felt output drop to almost nothing. But somebody else mounted a couple of P14's on a heatsink and got better cooling.

So all I can say is this: try it.

Oh. You could put a fan at the front of your 5.25 bay and another at the back. Nice experiment to try. Will it improve output? You tell us.

This
post #7 of 7
Thread Starter 
I've just thought about it in a more physical way.

The act of putting a fan in front of another (call this A) will merely be providing a faster stream of air to the fan behind A (call this B).

Since the motion of the fans will not be in sync, the fact that A is providing a faster stream of air to B is almost irrelevant considering B would already have an ample supply of ambient air to draw into the case without needing A.

Whilst in theory if I had a gap between the fans it may blow slightly cooler air into the case, mounting them together would just create turbulence as all the air cannot flow straight through both fans unimpeded.

So if this is correct then bolting the two fans together shouldn't be beneficial at all.

I've also realized I'd have a black stack of fans just sitting there in the case when the rest of them will be white LED ones which could make the case look a bit mismatched.

On a side note, if in the HAF-X I'm going to have 2x 200mm white LED fans, then below that the H100 in a push/pull config with white LED fans on the bottom of the H100's rad. Does anyone see any aesthetic value in having the fans between the rad and the top of the case as white LED also?

Thanks again for the help. smile.gif
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