Air pressure questions (not sure where else to post)

ehosinski · Oct 31, 2016

Hey guys,

So I just built a new PC this past weekend and I had a question to pose for all of you. I am currently running the Corsair 760T Full tower with 2 140mm intake fans in the front, 1 120mm intake fan on the bottom, 1 140mm intake fan in the top back and 3 120mm exhaust fans on the top of the box attached to a Thermaltake 360mm radiator water cooling system. My question is, would it be beneficial to run the extra 3 120mm fans on the top of the radiator as well to help with push/pull or would this create negative pressure? In total it would be 4 intake (3 140mm and 1 120mm) and 6 exhaust (6 120mm) but all of the exhaust is in the top of the case. Also to note my PSU is facing a downward direction so the fan from that does not add to the system pressure.

Thanks Everyone!!

greens · Oct 31, 2016

Stacking fans does not make it twice as strong.

It only makes it as strong as it should be without resistance.

So you're really at 3x140mm+1x120mm intake and 3x120mm exhaust.

Still positive.

Although i'd probably flip that rear 120 around, no one wants to intake the stale dusty air from behind the PC.

ehosinski · Oct 31, 2016

greens :

So is it really even worth adding the other 3 120mm's on top of the radiator then? My PC is in a relatively open space as well, I think the Top Rear fan should be ok the way it is. Also, if I swap it, wont my Air Pressure become more neutral? I'd like to stay on the positive side of air pressure for dust accumulation purposes.

ehosinski · Oct 31, 2016

greens :

So is it really even worth adding the other 3 120mm's on top of the radiator then? My PC is in a relatively open space as well, I think the Top Rear fan should be ok the way it is. Also, if I swap it, wont my Air Pressure become more neutral? I'd like to stay on the positive side of air pressure for dust accumulation purposes.

greens · Oct 31, 2016

Net balance isn't any worse for dust than a positive system. Negative is the dust accumulator.

I'd only add another set of fans if i thought the radiator could benefit from it.

My logic with the rear fan is that it is actually negating one of your top fans' flow.

It is pulling air from behind the case, pushing it up into the top fan, which is blowing it out to be sucked in by the rear fan and blown into the top... repeat. But it is probably a non issue in all reality and your extra positive system is working just fine for you, i'm guessing you have it well filtered.

ehosinski · Oct 31, 2016

greens :

Net balance isn't any worse for dust than a positive system. Negative is the dust accumulator.

I'd only add another set of fans if i thought the radiator could benefit from it.

My logic with the rear fan is that it is actually negating one of your top fans' flow.

It is pulling air from behind the case, pushing it up into the top fan, which is blowing it out to be sucked in by the rear fan and blown into the top... repeat. But it is probably a non issue in all reality and your extra positive system is working just fine for you, i'm guessing you have it well filtered.

Filters are actually coming in today, and I definitely understand what you are saying, I might swap that fan around then, if nothing else, to help the top fan perform its job. At the moment though my system temperature stays easily between 28-32 degrees celsius and the cpu at a static 30 (without stress) and about 5-8 degrees higher (with stress). I appreciate the help, I may just stick with the 3 fans on the radiator then. I'll just have to keep an eye on temps as I use it to see if I need more

ehosinski · Oct 31, 2016

greens :

Net balance isn't any worse for dust than a positive system. Negative is the dust accumulator.

I'd only add another set of fans if i thought the radiator could benefit from it.

My logic with the rear fan is that it is actually negating one of your top fans' flow.

It is pulling air from behind the case, pushing it up into the top fan, which is blowing it out to be sucked in by the rear fan and blown into the top... repeat. But it is probably a non issue in all reality and your extra positive system is working just fine for you, i'm guessing you have it well filtered.

Filters are actually coming in today, and I definitely understand what you are saying, I might swap that fan around then, if nothing else, to help the top fan perform its job. At the moment though my system temperature stays easily between 28-32 degrees celsius and the cpu at a static 30 (without stress) and about 5-8 degrees higher (with stress). I appreciate the help, I may just stick with the 3 fans on the radiator then. I'll just have to keep an eye on temps as I use it to see if I need more

greens · Oct 31, 2016

Filters are the best.

Yeah man based on the sound of things, you can't go wrong.

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Air pressure questions (not sure where else to post)

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