800 RPM fans?

[ALTBOULI]

Recently bought the Phanteks P500a (non-rgb case). I heard some bad things about the 2 stock fans so have started purchasing additional/replacement fans.

I bought 2 Noctua 140mm fans that are ultra quiet (Noctua NF-A14 ULN). The concern that I have is that their only 800rpm.

Airflow: 46.9 CFM
Static Pressure: 0.69mm H20

Noctua on their website state the fans are "ideal for use on watercooling radiators or as an upgrade for 140mm case fans."

I'm just wondering whether they would be suitable as Intake or Exhaust fans or both?

Ideally 3 front intake fans, 1 rear exhaust and 1 (possibly 2 top fans as exhaust).

So should I put the 2 fans I already purchased as Exhaust fans and buy more powerful but slightly louder fans as intake?

 

[ALTBOULI]

0.69mmH2O is rather low rating for radiator fans. I build several systems every month and haven't used an exhaust fan in so long I can't remember the last time.
Attached link below to basic guide to how airflow works and how to optimize case airflow might be helpful.
https://forums.overclockers.co.uk/t...-i-put-my-temp-sensor.18564223/#post-26159770

I'm guessing even lower for a pure air build (won't be using radiators as I'm going fully air cooled)

 

[ALTBOULI]

You still want a measure of static pressure, to push the airflow through the vents, grilles, meshes, filters, HDD cages and whatever else.
If you can get decent SP with massive airflow, all the better.

OK so am I better off putting these as exhaust fans and buying higher airflow + higher static fans as intake? That should mean a positive airflow right?

What I'm not sure as a first time builder is to whether positive or negative airflow is better, there seems to be a lot of mixed opinion online...