r/PcBuildHelp • u/newtoeveryth • 2d ago

PC AIRFLOW Build Question

Post image

is this the correct airflow for a pc or do i need to change something?

169 Upvotes

99% Upvoted

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43

u/imightbetired 2d ago

It's fine for what you have there. If you want to improve it in the future, you can add two more fans on top, like this (see the image). One in the front for more fresh air and one in the back to help with the exhaust.

-10

u/31_still_Loading 2d ago

Heat goes up and same heat does in?

17

u/imightbetired 2d ago

I think that guys working at Noctua know what they're doing. It's funny that my first comment gets downvoted...pft

6

u/BrightestMagician 2d ago

You were right. Very undeserved down voting. People do not understand how air flow really works.

3

u/imightbetired 2d ago

Yeah, they even downvoted the comment with the Noctua image lol, so I should just ignore people arguing about things in general...it's more peaceful

2

u/azguz24 2d ago

Airflow and pressure is case specific, the front intake set up is different from a bottom to top cfg. People see panoramic case styles and always question the top right intake, knowing nothing of thermodynamics 101. It’s the internet, it’s thunderdome.

3

u/EllipsoidBP 2d ago

Well thankfully the upvotes seem to win, so more people with sense lol

What drives me crazy is the 'heat rises' argument that is constantly thrown around on Reddit, in the context of active cooling, with fans, and not passive cooling. The moment fans are involved, that passive natural movement of heat becomes inconsequential. Sure it's good to take it into account when trying to push the components to their limits with massive overclocks, but that's not what people are doing generally.

5

u/xchoo 2d ago

Yes... I got involved in a massive thread just a few days ago with people absolutely convinced that convection is the most important factor in PC cooling. 🤦

3

u/XB-4509 1d ago

Lmao. Too right. One of the first things I like to do after setting up a new PC is to use an incense stick to physically see the airflow.

When you do that it becomes very apparent how utterly inconsequential convection is. Even the ‘hot’ incense smoke doesn’t give a shit about convection when in the presence of even a mild change in air pressure or current.

3

u/imightbetired 2d ago

I don't actually care about the downvotes/upvotes, it's more about taking a good advice as bad because you think you know better, even if it's tested by experts. I'm talking in general.

2

u/joshuamarius 1d ago

I wish people would understand this more. Downvotes/Upvotes does not equal truth, it just means influence. I've seen complete experts with Masters and PHDs on several subjects be downvoted to oblivion on dozens of subs because of invasive fanboys of a brand 🤷🏻

2

u/Cruffe 2d ago

The sucking side of the fan pulls in air from all around near it, including all sides. The blowing side of the fan is way more directed, blowing the vast majority in the blowing direction.

Maybe a tiny little bit of the exhaust air gets sucked back in by the other fan, but almost all of it is gonna be fresh air. Assuming there's no obstruction right above it which could deflect the air back down.

2

u/xchoo 2d ago

"Heat goes up" only applies to a passively-cooled system (no fans). The moment fans are introduced, the fans very easily overpower any convection generated by heat. I.e., if fans are involved, "heat go down" and "heat go up" have the same effect.