Is This Fan Configuration any good?

jasperng18 · Apr 21, 2014

Case NZXT Phantom 530

Push: (Negative pressure)
- Top 2 x 200mm cooler master megaflow 110 cfm
- back 140 nzxt FN 62.5 cfm
Total CFM = 282.5 cfm

Pull: (Positive pressure)
- 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?

The Front, Bottom and Side fans have restricted airflow because of metal mesh and filters will it drastically decrease the CFM?

justcallmetom13 · Apr 21, 2014

I don't think you need the neutral 140 mm. Other then that it's good.

A little inbalance in pressure won't hurt, especially if it's positive. That way at least the warm air would be pulled out. The purpose of the push is to bring cool air from the outside so you're good.

leeb2013 · Apr 21, 2014

when you say push, do you mean push out of the case? I presume you do.

It seems like a reasonable setup. I think your calculation is a bit mixed up as all fans are flowing in the same direction, not opposing, and you're mixing up airflow and pressure. There won't just be 8.48cfm air flow.

I found that mesh and filters drastically reduce air flow and increase noise. So much so, that I removed my air filters.

jasperng18 · Apr 21, 2014

justcallmetom13 :

The neutral fan is for blowing all the air to the exhaust fans because if it is positive pressure case the hot air tend to be stuck inside the case, and all of my intake fans are at the bottom of the case even the side fans.

jasperng18 · Apr 21, 2014

leeb2013 :

So how will I compute for the airflow of the fans to know if it is a positive or negative pressure case?

justcallmetom13 · Apr 21, 2014

jasperng18 :

justcallmetom13 :

The neutral fan is for blowing all the air to the exhaust fans because if it is positive pressure case the hot air tend to be stuck inside the case, and all of my intake fans are at the bottom of the case even the side fans.

Oh okay.

leeb2013 · Apr 23, 2014

jasperng18 :

it's not simple, you need computer simulation. You'll have lots of air flow as all your fans are moving air in the same basic direction, however the pressure at any point in the case is only something a computer can calculate. Even assuming a completely empty box, the extraction fans have a combined outlet of 282.5cfm, but that figure is assuming the air they are moving is initially static. But you have fans putting air into the case to, creating an initial positive pressure, which would allow the extraction fans to spin slightly fast/flow more as they are shifting air which is already moving. As a rough guess, because your pull and push is nearly equal, I think you'll have roughly neutral pressure.

If you had 3 huge intake fans and one small outlet, then this would clearly be positive pressure as it's unlikely the outlet could flow enough air to compete with the inlet. But in your case it's not so clear cut.

It's best not to worry about it. You'll have ample air flow and will likely only need your fans on their lowest speed.

jasperng18 · Apr 23, 2014

leeb2013 :

jasperng18 :

it's not simple, you need computer simulation. You'll have lots of air flow as all your fans are moving air in the same basic direction, however the pressure at any point in the case is only something a computer can calculate. Even assuming a completely empty box, the extraction fans have a combined outlet of 282.5cfm, but that figure is assuming the air they are moving is initially static. But you have fans putting air into the case to, creating an initial positive pressure, which would allow the extraction fans to spin slightly fast/flow more as they are shifting air which is already moving. As a rough guess, because your pull and push is nearly equal, I think you'll have roughly neutral pressure.

If you had 3 huge intake fans and one small outlet, then this would clearly be positive pressure as it's unlikely the outlet could flow enough air to compete with the inlet. But in your case it's not so clear cut.

It's best not to worry about it. You'll have ample air flow and will likely only need your fans on their lowest speed.

If the difference in CFM is over 80+ can we assume that it is a positive or negative pressure.

leeb2013 · Apr 23, 2014

jasperng18 :

leeb2013 :

If the difference in CFM is over 80+ can we assume that it is a positive or negative pressure.

if the inlet is more than the outlet, it'll always be slightly positive, but could be barely measureable (I think my sentence above was slightly misleading). I think with a decent cfm difference as you state, you'd have reasonable positive pressure.

jasperng18 · Apr 23, 2014

leeb2013 :

Because as you state is it very hard to measure the exact airflow of the case because there are a lot of variables to consider like the restriction of intake fans because of filters hard drive cage or metal mesh and also there are a lot of part that would block the airflow from front/bottom of the case to the top rear of the case.

current setup
Phantom 530
Intake:
front:
FX 200 = 103 cfm

Buttom
Corsair sp120 = 62.74 cfm

Exhaust
Back:
FN 140 = 62.5

Top:
240 radiator cm seidon
2 x 120 mm = 172.3 cfm

I have tested my rig with smoke and I have seen that on front of the case it is positive pressure and on the back it became negative pressure. it is really hard to know

And when I max out the fan radiator even the back 140mm fan hardly blows air out and if the 140m is in low settings it also became an intake.

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