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Case fan questions

post #1 of 13
Thread Starter 
Hello,

I recently upgraded my old mid-tower case (CM 690 II Adv.) to a full-tower (CM Storm Trooper)! However, I am at a bit of a loss as to how I should have my fans set up..

I don't really understand the differences/advantages between 'static pressure' and 'high airflow' fans.. which are used for what application(s)?

I can conceive, conceptually, which fans I would want to be intake and which to be exhaust but I don't fully comprehend how negative or positive case pressure can affect performance and/or dust build-up within the case.

Currently, I have the following setup:

(1) 120mm intake, front
(1) 120mm cross-vent., side (rotated one of the HDD cages to cross-vent directly through my case, in one side and out the other)
(1) 120mm intake, side panel
(1) 120mm exhaust, side panel
(2) 120mm exhaust, push config. for H100 liquid CPU cooler
(1) 140mm exhaust, rear

I do have (1) optional mounting space left, available for a 120mm fan, in the bottom of the case.. is it really useful to put a fan here??

I mounted my PSU to intake from the top (fan faces inward of case, not outward/down, and obviously exhausts out the rear)

I can understand that too much intake and not enough exhaust (positive pressure?) could possibly create a heat build-up within the case.. but, I could also see how too much exhaust and not enough intake (negative pressure?) would dissipate heat efficiently but at the same time literally suck dust into the fan at a presumably faster rate.

I gather the goal is to have an equal a balance as possible of both intake and exhaust (circulating cool air and dissipating heat), all the while minimizing any dust collection.. am I getting that right?

I do have mesh grilles on all my fans, so it could just be that regular cleaning of those is inevitable with a case having as many fans as I do?

Lastly, if I understand correctly: my H100 will be more efficient in a push-pull config (that is, 2 fans pushing air through the radiator and 2 fans drawing air out the other side) , is that correct?

Basically, my questions (in summation) are:

How many intakes should I have?
How many exhausts should I have?
Which fans should be (high)airflow-oriented?
Which fans should be static(pressure)-oriented?

Thanks, in advance, for any responses! smile.gif
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post #2 of 13
Quote:
How many intakes should I have?
How many exhausts should I have?
Which fans should be (high)airflow-oriented?
Which fans should be static(pressure)-oriented?

You should have as many intakes as possible, just not in the roof (as there is usually not any filters up there and it could mess with other air flow) Put 2 fans in the front for intake, if i where you i would remove those 2 that are screwed onto the HDD cages as the harddrives dont really need cooling. Basically the only thing you need to do is remove all fans. Put 2 in the front. put pushpull (doesnt really matter anyways 1-4C) on your h100 as exhuast in the top. By doing this we make an airflow from front intake to top exhaust. The fan on the back you might aswell remove all together. If this doesnt help your temps just PM me later. Also i see there is a small HDD on the bottom of the case covering a fan mount, remove the HDD cage and put a fan there as intake.

As for air flow and pressure. Pressure is more optimized for rads and dense heatsinks, if it doesnt have pressure the fan will have problems pushing air through the rad / heatsink and the air might actually shoot back. otherwise a mix of airflow and pressure is wanted so it can pull air through grills and dust filters.

Rep if helpfull? biggrin.gif
 
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post #3 of 13
Everything will say something different but here my input

With fans all case fans need to be high airflow as they are normally unrestricted and don't need a high static pressure to push a lot of air but radiators will need high pressure fans to get the air through the fins

With radiator fans push is better than pull, push will give much better performance than pull, push/pull will give slightly better performance than push

Fan setup is normally dependant on case and where components are etc etc but here are some general rules

Heat rises so exhaust out the top. If you can mount your psu at the bottom of the case drawing air from outside and exhausting outside then do it so excess heat from other components isn't being sucked into it. Most will have front intake and rear exhaust, this is mainly so cool air runs over hard drives and to give gpus cool air and to exhaust heat from gpus and cpus straight out the back. Cpu heatsinks normally get orientated to pull air from the front to the back. Side fans are great for getting some extra cool air pushing straight to your gpu. If you have extra slots for fans then use them, more fans won't hurt except maybe your ears lol. Using your bottom fan hole as an intake will be fine

As for case pressure and amount of intakes/outtakes this is quite often case dependant which normally works out about even or will have maybe 1 more intake than exhaust. Many will say to have slightly more intake than exhaust to give the case positive pressure to keep cool air in quantity and to stop dust particles out. In theory this works and some will say this will help heat build up but not really as the positive pressure will push the air out of other holes and not just the fans

Hope all this helps :-D
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post #4 of 13
Quote:
Heat rises so exhaust out the top.

I agree with everything including this. But the rising of hot air isnt really that "strong" that it matters. a fan pushing it horizontally will easily keep it from moving up.
 
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post #5 of 13
Quote:
Originally Posted by Rangerjr1 View Post

I agree with everything including this. But the rising of hot air isnt really that "strong" that it matters. a fan pushing it horizontally will easily keep it from moving up.

True but in this case we are thinking more of the standard case layout. Main heat output will come from CPU/gpu area where intake fans are normally quite far at the front of case so that heat from there naturally in that position will rise to the top of the case so we put exhaust at top and rear right near this area to pull it straight out. With standard case fans at this CPU/gpu area we would get a dead spot with not much airflow, no fans to push sideways so heat will rise. This is also why in dual gpu configs the top card is always hotter even though gpu pushes air out the rear, heat rises from bottom card to top

Hope you understand my reasoning here
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post #6 of 13
Quote:
Originally Posted by liamstears View Post

True but in this case we are thinking more of the standard case layout. Main heat output will come from CPU/gpu area where intake fans are normally quite far at the front of case so that heat from there naturally in that position will rise to the top of the case so we put exhaust at top and rear right near this area to pull it straight out. With standard case fans at this CPU/gpu area we would get a dead spot with not much airflow, no fans to push sideways so heat will rise. This is also why in dual gpu configs the top card is always hotter even though gpu pushes air out the rear, heat rises from bottom card to top

Hope you understand my reasoning here

Yea sure i do. As i said he should have 3 intakes on front/bottom and the only exhausts on his 2-4 fans on H100. If that becomes too hot for CPU he COULD put a fan on the back exhaust to put out other hot air.
 
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post #7 of 13
Quote:
Originally Posted by Rangerjr1 View Post

Yea sure i do. As i said he should have 3 intakes on front/bottom and the only exhausts on his 2-4 fans on H100. If that becomes too hot for CPU he COULD put a fan on the back exhaust to put out other hot air.

I would say just use the rear exhaust, more fans never hurts

This and adding a side intake would be ideal fan setup
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post #8 of 13
Thread Starter 
I agree that heat rises, naturally, no matter how confined the space and really couldn't see the advantage of a top-mounted intake regardless of fan filters

as for HDD cooling, I'm running (2) SSDs - one of them a samsung 840 pro (notorious for very low temps) - and one conventional Seagate Barracuda 2TB HDD
(1) 120mm is dedicated for the cooling of these drives, as described above, with a cross-vent fan. also, will the cross-vent not keep air circulating to some extent?

I never really liked the idea of bottom intakes due to the fact that my case sits directly on the floor, but as I said I do have filters on all fans (yes, including top)

CPU cooler orientation is irrelevant since I have a water block.

rear exhaust can't hurt, like 'liamstears' said. side fans also seemed like a good idea to blow directly on the GPU/CPU/mobo(in general)

my intake to exhaust ratio is 2:4 right now which seems unbalanced, no?

I'm thinking I flip one of the side fans so theyre both intakes, turn my PSU upside-down (eliminating unnecessary extra heat running through my already hot PSU), and add a bottom intake, keep the 120mm dedicated for HDDs just because.. equaling an intake to exhaust ratio of (roughly - due to rear 140mm) 4 to 3.4 positive case pressure

possibly make the cross-vent a front intake, in which case i could make the bottom an exhaust (maybe?)

make sense?
   
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post #9 of 13
Quote:
Originally Posted by jchap1590 View Post

I agree that heat rises, naturally, no matter how confined the space and really couldn't see the advantage of a top-mounted intake regardless of fan filters

as for HDD cooling, I'm running (2) SSDs - one of them a samsung 840 pro (notorious for very low temps) - and one conventional Seagate Barracuda 2TB HDD
(1) 120mm is dedicated for the cooling of these drives, as described above, with a cross-vent fan. also, will the cross-vent not keep air circulating to some extent?

I never really liked the idea of bottom intakes due to the fact that my case sits directly on the floor, but as I said I do have filters on all fans (yes, including top)

CPU cooler orientation is irrelevant since I have a water block.

rear exhaust can't hurt, like 'liamstears' said. side fans also seemed like a good idea to blow directly on the GPU/CPU/mobo(in general)

my intake to exhaust ratio is 2:4 right now which seems unbalanced, no?

I'm thinking I flip one of the side fans so theyre both intakes, turn my PSU upside-down (eliminating unnecessary extra heat running through my already hot PSU), and add a bottom intake, keep the 120mm dedicated for HDDs just because.. equaling an intake to exhaust ratio of (roughly - due to rear 140mm) 4 to 3.4 positive case pressure

possibly make the cross-vent a front intake, in which case i could make the bottom an exhaust (maybe?)

make sense?

Well if you are so sure about whats good and what is not why do you ask for our help? You seem to be perfectly capable of placing fans in a good setup.
 
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by Rangerjr1 View Post

Well if you are so sure about whats good and what is not why do you ask for our help? You seem to be perfectly capable of placing fans in a good setup.

I was asking to confirm if my logic equated to what is actually best..
   
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