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what type of airflow do i have? *carefully drawn diagram included*

post #1 of 18
Thread Starter 
278

all 7 fans are these: http://www.newegg.com/Product/Product.aspx?Item=N82E16835103061

ALL & FANS OPERATE AT 2000 rpm and 69 CFM

break down incase you cant get the diagram

haf 912 case
2x 120mm fans intake front bottom
1x 120mm intake fan side panel
2x 120mm exhaust fans top rear
2x 120mm exaust rear fans blowing threw h60 radiator

all fans operate the same levels max power

what kind of airflow do i have and what can i do to improve it (if any) thanks!
post #2 of 18
Nothing you can do to improve, overall it looks better good. since you have the same amount of fans on the case itself in taking and exhausting then its neither positive or negative airfow.
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Casmatic
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post #3 of 18
i think the fans at the top of the case should be sucking in air from the outside.
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Second Intel Rig
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post #4 of 18
Thread Starter 
Quote:
Originally Posted by lilraver018 View Post

Nothing you can do to improve, overall it looks better good. since you have the same amount of fans on the case itself in taking and exhausting then its neither positive or negative airfow.

4 exuast 3 intake, but 2 of the exuast fans are stacked pushing/pulling threw a radiator which i believe takes away some of the CFM
post #5 of 18
you have a negative pressure case.

intake fans should have filters on them so that cuts down on the CFM on intake.

you also failed to take into consideration of PSU and GPU as exhaust points.
post #6 of 18
Quote:
Originally Posted by psyclum View Post

you have a negative pressure case.
intake fans should have filters on them so that cuts down on the CFM on intake.
you also failed to take into consideration of PSU and GPU as exhaust points.

You can't actually tell if the case differential pressure is positive or negative without measuring it as how much the fans flow is based on the internal resistance in the case.

You can get a hint as to if the case is positive or negative pressure by looking for dust trails around case openings - that are not close by the fans. If there are dust trains leading into the case you have negative pressure. If not then you may have a neutral or positive pressure case. Some folks use toilet paper to see if it pushes out or pulls against the case at tiny case opening away from the fans. In is negative, out is positive.

A positive pressure case will reduce the amount of dust that enters you PC case. You don't need a lot of pressure however to keep the dust out and air flowing where it's needed for best cooling.

The only means to tell what combination of fans and their direction works best for YOUR PC case and hardware is by careful testing. People can speculate but there is no substitute for actual testing.
post #7 of 18
all i'm saying is it doesn't take a rocket scientist to figure out that if you had 3 filtered intake fans vs 3 unfiltered exhaust fans the unfiltered exhaust fans will win... you are correct in saying that there are alot of variables involved. however, simple math also comes into play here. if you had 70cfm intake fans that are cut down to 50cfm due to filters, and you had the same 70cfm fans on the exhaust side... there is a difference of 20cfm in exhaust airflow that will contribute to a pressure differential resulting in negative pressure. that negative pressure will contribute to the change in airflow pattern in the case turning some exhaust ports (slow spinning PSU fans) into intake ports. which attract dust in areas you do not want.
post #8 of 18
Thread Starter 
so the question of can i improve it is a no? lol

i have some spare fans should i go for positive?
post #9 of 18
Quote:
Originally Posted by Itsonme View Post

so the question of can i improve it is a no? lol

i have some spare fans should i go for positive?

What you have right now is good airflow. It is slightly negative because you have 4 120mm fans exhausting and 3 intaking but remember that 2 are on the same hole with a radiator in between. I would honestly not change anything and keep it as is. You have enough fans.
post #10 of 18
improvement is a relative thing. haf is notorious in having little to no air filter so it's engineered to be a dust magnet. if you cut down your airflow by adding air filters, you should consider adding more intake, OR reducing exhaust. IMO taping off the top rear exhaust fan will actually help in the overall airflow pattern of the case. this way you only have 1 exhaust on top (draws heat from the RAM sticks) and 1 exhaust rear (your H60 rad which also draws heat from your VRM'S) this SHOULD make your case more balanced and improve overall thermal efficiency. you won't see a drop in temp, but you will see a drop in overall sound and dust level.

if you are REALLY fixated in getting more cooling, you can buy a higher quality 200mm fan to be mounted in the front replacing the 2x120mm fans you have currently there. switch the side panel fan out to a high quality 140mm fan instead, and maybe add a 3x5.25 bay fan cage like this

496

for additional cooling

however. IMO that is way overkill for your system. you wouldn't be using a HAF 912 if you have THAT much heat being produced in the system biggrin.gif most likely your existing thermal solution is perfectly fine and you are just nit picking trying to justify the $ you spent on fans you didn't actually need biggrin.gif
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