Positive pressure Vs negative

gjbf1 · 14 Jul 2023 at 20:43

Apologies, I know this has almost certainly been asked before, but what is the consensus on setting up case fans? More air in or out?

Thanks.

gjbf1 · 14 Jul 2023 at 20:57

Rroff said:
More air in with decent filters in place will hugely reduce dust problems inside the case.

Negative pressure can have some cooling advantages but most PC cases aren't ideally setup for that especially in respect to dust.

Thanks. But what about cooling and ensuring hot air is exhausted?

gjbf1 · 14 Jul 2023 at 21:46

Meddling-Monk said:
That'll be down to case design (size, internal placement of stuff, etc), fan placement positions, and fan speeds. But mostly on the fan speed (you run them at).

2 intake front. 1 exhaust rear, 1 or 2 exhaust top. Full speed. Typical case design.

gjbf1 · 15 Jul 2023 at 19:40

Looks like I'll end up with neither and go balanced given the configuration of the case I'll likely get will only support negative or balanced and turning the rear or top fans around will completely screw the airflow.

gjbf1 · 15 Jul 2023 at 21:19

No case yet as there was a problem with my order.

4x 140mm Be Quiet fans. 7800X3D. Not sure of card yet but could be anything so any level of power.

gjbf1 · 15 Jul 2023 at 22:07

Ok. Positive pressure seems to be the consensus.

gjbf1 · 15 Jul 2023 at 22:12

I'll use the slightly more powerful fans as intakes.

gjbf1 · 15 Jul 2023 at 22:15

Wing-Man said:
just have a good flow and your all good

Is 2x 140 intake and 2x 140 exhaust good enough?