Case Cooling Dynamics

[Rick G]

Are there any good rules of thumb regarding case cooling? e.g. If I add a case fan to the rear, should I use a higher speed (albeit louder) fan in the front to compensate for the power supply fan? i.e. Should the intake cfm = the output cfm?

[nikhsub1]

I think you will get many different opinions on this. Most it would seem, like to see slightly positive pressure, including myself ( more in than out). It is also important to cover all transient holes or gaps with tape to only allow air in and out via the fans.

[The Overclocker]

however the thing to aim for is equal air in and out and if you cant get it then positive air flow is better.