Postivie Pressure?

[Sniper564]

Hi, I am getting an Enlight 7237 and was wondering if i should have positivie pressure over negative pressure. So should I get a 42.5 cfm fan for outtake and 50cfm fan for intake? Or will the power supply fan make it negative pressure (im not sure how many cfms the power supply fan pushes out :))
Thanks. :)

[Flash]

I think the general consensus is that balanced pressure is best, or possibly slightly positive pressure. You don't want negative pressure because air will be sucked in through and between your drives and other nooks and crannies, causing general unpleasantness.

Can't say what the rating for your psf is, but I'd figure 20-30 cfm as a ballpark and aim to have that much more blowing in than you'll have for your exhaust fan. So, maybe an 80 or 92mm exhaust with a 120mm intake?
For greater flexibility you could get two 120mm fans and control their speed with a fan bus. That'll let you adjust the pressure on the fly. Also, a detuned 120mm fan is quieter than a smaller fan pushing the same cfm.

[Sniper564]

So maybe should I get a 50cfm front fan intake and maybe around like a 36cfm rear outtake fan?

[TT120]

I've tried both ways in my 7237 and found it a little better with positive pressure. Besides lowering my case temps a couple degrees, I'm not getting dust on everything.

[Sniper564]

Could someone tell me what the cfm rating on the 300watt power supply for the Enlight 7237 is?
Thanks.