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How to setup Fans and Radiators in 750D water-cooling build

post #1 of 36
Thread Starter 
Hello everyone, I have a few questions regarding the setup of fans and rads in my setup. I'm planning on mounting a 360mm rad up top with three 120mm fans and a 280mm rad in the front with two 140mm fans.

My question is how to place my fans to cool the radiators and maintain positive pressure and use PULL in order to make my build less prone to dust.

Up top I could have:

Case -> Fans pulling in air from outside -> radiator
or
Case -> Radiator -> Fans pulling air through radiator

I'm confused as to which setup would work best? I'm guessing the fans pulling through radiator might although I am not sure. I would prefer for the fans to be hidden, so option 1 wins in that regard.

In the front it would be the same deal. Either fans pulling from outside and into the radiator OR fans pulling through radiator.

Any feedback on these methods will be greatly appreciated! Thank you in advance thumb.gif
post #2 of 36
Generally, slow speed = pull, high speed = push, medium speed = it doesn't really matter. But push vs pull normally have similar performance. If you have the room push+pull will get you the best performance. And it always best to have the fans as intake, provide the radiators with fresh, cool air from outside the case. I would recommend some dust filters as well since the radiators will get dusty quicker than if the fans were exhaust.
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post #3 of 36
Thread Starter 
I might be misunderstanding something here. Is pulling from the outside and through the radiators the same as push? And pulling from the radiator and into the case the standard for pull?

In that case, I would prefer: Case -> Radiator -> Pull fans

TY
post #4 of 36
Maybe this will help. Imagine the top of the picture is the top of the case. You would one of the orientation on the right, fans as intake
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post #5 of 36
Thread Starter 
Wow that picture is great! I would be going with the 2nd one on the right of the picture for a PULL configuration and positive pressure up top.

Since it's best to have the fans as intake, the only option for pull fans would be again the 2nd diagram on the right? Pulling air through the radiator? Is that going to bring in cool air from outside through the rad, or simply suck hot air from the rad? Thanks!
post #6 of 36
Correct, if you want PULL, you want the 2nd one on the right. You would be able to see the fans on the inside of the case.

If you want the fans to be hidden from view on the inside of the case, you would want to use the first picture on the right. The fans would be pulling air through the case and pushing it through the radiator.

Both options perform about the same, so either option is a good choice.
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post #7 of 36
Thread Starter 
Ah okay, that clears things up. The problem with push though is that it's better for high rpm fans? If I'm going for low fpi and low rpm fans, pull may be better? Also, pull deals with dust better I've heard?
post #8 of 36
You're probably only talking 1-2 degrees of each other between push and pull. I do think it is easier to clean the dust from the radiators with the fans as pull. I would actually leave the fans on, and turn them down real low with the fan controller and blow canned air at the same time. Only problem with that is that then you are blowing all the dust into the case.
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post #9 of 36
I have my top rad pulling air out of the case and the back fan as an intake. I use the top as an exhaust since warm rises and all the other fans are used as intakes. (I also have a 750D)
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post #10 of 36
Thread Starter 
Would you recommend having the exhaust as intake? That would allow me to have the 360mm rad in exhaust...

The video that confused on Push / Pull was:

http://www.youtube.com/watch?v=UyC3lZ5WFMk

At around 56 seconds in, linus says that you can have the fans pushing through the rad, or have the fans pulling air, both on the same side. This is different than what we discussed earlier which was PUSH -> RAD -> AIR and RAD -> PULL -> AIR.

Thanks
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