Radiator fans sucking or pushing?

Dennyd1

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May 21, 2013
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I intend on having my radiator outside the case, and hopefully with their own wall plug. So they won't be contributing to the airflow within the case.

With that said, which is better, to have the fans sucking the air through the radiator or pushing it through. I know that just from feeling a fan, there is much more airflow from the front end than the back, but if these fans mount to the radiator with an air-restrictive seal, then I'd think that the sucking of air would have greater air flow as the pushing of air would create positive air pressure that could cause some air back out.

If there is no restrictive seal to ensure that most of the air is flowing only between the radiator and the fan, then I'd think that pushing the air would be better as sucking the air would undoubtedly suck a large portion of its air from the sides, not even going through the radiator mesh.

Update:
Okay, pushing is what I assumed would be better. Yes, indeed, I would love to seal the gaps. I have never done this, and I did not know if I would find fans that already come with a seal to cover the gaps or if I have to rig something using maybe electrical tape or duct tape. I know that sounds tacky, so what do we usually use to cover the gaps with? Is there a special lining we can buy, or do we just figure something out using whatever we can find?

Oh yes, and I was considering buying 6 fans and mounting them on either side to assist each other in pushing and sucking, but I was going to see how much that would cost. I'm only using my liquid cooling system to cool a Core I7 3970x and a titan superclocked, thus I was thinking that 6 fans may not be necessary.
 

ddpruitt

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Jun 4, 2012
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For air passing through a radiator pushing is better because airflow is distributed better. Although you should seal the gaps between the fans and radiator in either case since a huge amount of the air won't go through the radiator if there's a gap.

Just think about it, the vast majority of radiators push air through the radiator rather than sucking it through.