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Is this a Positive or negative pressure case

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Exhaust
- Top 2 x 200mm cooler master megaflow 110 cfm
- back 140 nzxt FN 62.5 cfm
Total CFM = 282.5 cfm

Intake
- Front 200mm NZXT FZ 103 cfm
- Bottom 2 x 120mm Corsair SP120 62.74 cfm
- side 140mm nzxt FN 62.5 cfm
Total CFM = 290.98 cfm

Neutral:
-Pivot 140mm NZXT FX 98.3 cfm

So I am Planning on a positive pressure case.
is 8.48 cfm difference enough?
 
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It is a difference. Therefore, it is a positive. By the way, imagine a cubic foot. Now imagine 8 of them.

Now imagine 8 of them being jammed into your case, every minute.

Think that is enough? :D

BTW, is it kind of loud, sitting next to that box?
 
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It is a difference. Therefore, it is a positive. By the way, imagine a cubic foot. Now imagine 8 of them.

Now imagine 8 of them being jammed into your case, every minute.

Think that is enough? :D

BTW, is it kind of loud, sitting next to that box?

I have been thinking that all the Intake have mesh or Filter and it will decrease the airflow, so is it still a positive pressure case?

I am not that sensitive when it comes to noise and I can just switch the fan control to low. :peace:
 
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Put your hand on a spot where there is no fan on the case but has room enough for air flow and then wet your finger and see which side of your finger feels the chilly breeze then you will know. Good luck. lolz air mesh, good point though.
 
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Put your hand on a spot where there is no fan on the case but has room enough for air flow and then wet your finger and see which side of your finger feels the chilly breeze then you will know. Good luck. lolz air mesh, good point though.
For now I only got
Exhaust:
top: coolermaster seidon 240mm radiator push config with 2 x 120 mm stock fans 86.15 cfm each
back: NZXT FN 140 62.5 cfm
Total: 234.8 cfm

Intake:
Front: nzxt fz 200mm 103 cfm
Bottom: Corsair sp 120 62.74 cfm
Total: 165.74

so I can't really check if it is positive or negative because I haven't bought the other fans.
 
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Well, then it is a negative, at least until you get the other fans. If your numbers are real, exhaust is more than intake, thus, currently you are running a negative.
 
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So how could I be sure that when I buy all does fan my case would be positive pressure.
 
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It's not as simple as intake CFM and exhaust CFM. Airflow get's completely ruined by objects in the way of your airflow, AKA, every single piece of hardware. You might total up 282 CFM intake, but maybe 50% of that get's redirected or becomes idle within your case because of hardware obstructions. Your fans may not be 100% accurate in their CFM ratings, and some of your airflow will inevitably get leaked elsewhere other than the exhaust areas. Not to mention processor and GPU fans will mess up any direct airflow. There is no way to specifically and accurately calculate case air pressure.

Well, then it is a negative, at least until you get the other fans. If your numbers are real, exhaust is more than intake, thus, currently you are running a negative.
If you had an empty and streamline case, that was completely airtight besides intake and exhaust, this would be true.
 
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It's not as simple as intake CFM and exhaust CFM. Airflow get's completely ruined by objects in the way of your airflow, AKA, every single piece of hardware. You might total up 282 CFM intake, but maybe 50% of that get's redirected or becomes idle within your case because of hardware obstructions. Your fans may not be 100% accurate in their CFM ratings, and some of your airflow will inevitably get leaked elsewhere other than the exhaust areas. Not to mention processor and GPU fans will mess up any direct airflow. There is no way to specifically and accurately calculate case air pressure.

So what you are saying that there is no way to know if it is positive or negative, just hope for the best when you already bought the fans. and see if it is positive or negative.

The cpu airflow will not be a problem because I am using a 240mm radiator on top of the case and I already remove the hard drive cages so that the front fan will not be restricted, the only thing that will obstruct the airflow would be the GPU.

Will the pivot fan help with the idle airflow.
 
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So what you are saying that there is no way to know if it is positive or negative, just hope for the best when you already bought the fans. and see if it is positive or negative.

The cpu airflow will not be a problem because I am using a 240mm radiator on top of the case and I already remove the hard drive cages so that the front fan will not be restricted, the only thing that will obstruct the airflow would be the GPU.

Will the pivot fan help with the idle airflow.

Something @lilhasselhoffer mentioned in a different thread

"My two cents; this is a stupid debate.
A fan is rated to move a certain volume of air, at a given temperature and density, over a certain period of time. The temperature and density are rarely defined, and flow interference is never really touched on. As air is extremely compressible, neither of these options actually makes much sense.


Thought experiment time. You have a case with no outlet, and one or more inlets; what exactly have you made? They call this a compressor. It takes air of known temperature and density, but then jacks both of them up to fit more molecules into the containment vessel.

Likewise, you could have everything flowing out of the case. This is a vacuum tube. Energy transfer here sucks (you lose conductive heating), but the vacuum is a superb thermal energy transfer barrier. This is how some long lasting food products and beverage containers prevent heating.

So, the take away here is to have approximately even input and output. The air will tend to flow, rather than compress. People argue that less dust is collected in positive pressure configurations, but there is no real evidence out there, beyond anecdotes."
 
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Haha I have seen this post before :)

And I could say that the negative air pressure tends to be cooler because I have seen some test and through experience but tends to get more dust. Oppose to a positive pressure have less dust but tends to be hotter.

So I have decided to go for the negative pressure case because it is more harder to have a positive pressure for my case because all the intake have metal mesh and filters. I would need a high cfm intake which tends to consume more power that my case only have a 30watts power in its fan control.
 
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yep with positive air pressure you may control the dust that entering your case with your filter, personally i would pay attention to any spot that need more cooling
positive or negative it doesnt affect much if you can point to any hardware that need more cooling
 
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Depends on what the components are

for example: if you have a videocard that dumps heat into the case or blows it out the back
or if your cpu cooler blows down onto the board, or blows it out the back, or if it has a small fan but a lot of fins, requiring a lot of "wind".

The OP shouldn't worry about it, its kind of silly. If you want more positive pressure make your exhaust fan slower, and vice versa for negative.

Can a 200mm NZXT 20dba fan really move 100cfm?
 
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well you can use some smoke for test in some places... use those Indian smelly sticks in intakes and see where it goes through...

You can use some transparent plastic bag or wrap to simulate the case door and see trough :)
 
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well you can use some smoke for test in some places... use those Indian smelly sticks in intakes and see where it goes through...

Until your GPU smells like it's farting lavender.
 
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Until your GPU smells like it's farting lavender.

Use those apple or cocoa ones, those aren't that bad, but yeah but at least it will be a fine simulation.
 
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yep with positive air pressure you may control the dust that entering your case with your filter, personally i would pay attention to any spot that need more cooling
positive or negative it doesnt affect much if you can point to any hardware that need more cooling

I am planning to cool my cpu and gpu. My cpu has a 240 seidon that is installed on top of the case and my gpu in blowing ai to the sides.

I am planning to overclock both.
 
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Depends on what the components are

for example: if you have a videocard that dumps heat into the case or blows it out the back
or if your cpu cooler blows down onto the board, or blows it out the back, or if it has a small fan but a lot of fins, requiring a lot of "wind".

The OP shouldn't worry about it, its kind of silly. If you want more positive pressure make your exhaust fan slower, and vice versa for negative.

Can a 200mm NZXT 20dba fan really move 100cfm?

I would want all of my fans to be 100% at a time to have the optimal cooling for overclocking. But nice idea though for regular use, i can connect both top 200 mm exhaust to my motherboard so i can control its rpm there and the rest on the fan control of nzxtphantom.

And the 200mm nzxt fans move 100 cfm, I just copy the data from there website
 
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Negative pressure is more efficient or cost less for the same amount of cooling. Positive pressure is cleaner, quieter but requires more fans or pressure due to the filters and the heat is being pushed out instead of sucked out.

If you really want positive presume then the only fan to exhaust is the rear facing fan
 
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Use those apple or cocoa ones, those aren't that bad, but yeah but at least it will be a fine simulation.
you can use sandalwood smell if you like it. Or use bong? That will definitely create a positive pressure :roll:
 
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Use those apple or cocoa ones, those aren't that bad, but yeah but at least it will be a fine simulation.
I would try that if I already bought all the fans thanks.
Negative pressure is more efficient or cost less for the same amount of cooling. Positive pressure is cleaner, quieter but requires more fans or pressure due to the filters and the heat is being pushed out instead of sucked out.

If you really want positive presume then the only fan to exhaust is the rear facing fan

Yup is is more efficient and it is more plausible for my case because the only thing blocking the top exhaust is the 240 mm radiator rather than the intake that all are hindered by mesh and filters.

so I have decided that I am going for a negative Pressure case if I am going to overclock and a positive pressure if not.

Negative pressure:
Intake
- Front 200mm NZXT FZ 103 cfm
- Bottom 2 x 120mm Corsair SP120 62.74 cfm
- side 140mm nzxt FN 62.5 cfm
Total CFM = 290.98 cfm

- Top 2 x 200mm cnzxt fn 200 166 cfm
- back 140 nzxt FN 62.5 cfm
Total CFM = 394.5 cfm

difference: 103.52

Positive pressure:
Intake
- Front 200mm NZXT FZ 103 cfm
- Bottom 2 x 120mm Corsair SP120 62.74 cfm
- side 140mm nzxt FN 62.5 cfm
Total CFM = 290.98 cfm

- Top 2 x 200mm cnzxt fn 200 166 cfm (7 v 83 cfm) will be controlled by the motherboard so I can adjust it it the lowest possible setting
- back 140 nzxt FN 62.5 cfm
Total CFM = 228.5 cfm

difference: 62.48


Is this a reasonable set up?
is the difference in CFM is more than enough to offset the filters and mesh?
 

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I have no strong feeling either way.
 
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Can a 3 pin connector o the motherboard can handle 16.8 watts? because 2 x 200mm nzxt FN fans consume 16.8 watts
 
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Can a 3 pin connector o the motherboard can handle 16.8 watts? because 2 x 200mm nzxt FN fans consume 16.8 watts

It will limit it. Probably around 10w so they will not run full speed
 
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