Fans push air one direction. They dont suck air. So why have 'exhuast' fans?
because
>>53597471
Every moment is simultaneously a cause and effect.
>>53597471
Because you don't understand how fans work.
>>53597471
>They dont suck air
Yes they do. Pushing air out causes a vacuum on the other side that gets continually filled in with new air.
>>53597471
https://en.wikipedia.org/wiki/Vacuum
>>53597471
exhaust fans just push air out of the case
intake fans push air into the case
if your intake pressure is higher than your exhaust pressure, you have positive pressure
if your intake pressure is lower than your exhaust pressure, you have negative pressure
>>53597662
What defines pressure?
what is the ideal amount of pressure?
>>53597471
"Exhaust" fans are useful in the situation where you have a molded shroud around the relevant portions of your case. Then you can use negative pressure to suck air into the shroud.
Obviously you can use positive or negative pressure into a shroud (or any ``closed volume") and the only difference is where the dust enters.
It really is all preference.
>>53597733
For simplicity and intuitiveness' sake we define pressure to be the density of fluid per unit volume.
If the pressure in a volume is smaller than the pressure outside of the volume, then the pressure in the volume is known as negative pressure, and fluid will attempt to push into the volume. Negative pressure causes dust buildup all over a case.
The opposite is known as positive pressure, where air attempts to exit the volume anywhere it can. In this case, dust is more localized to the location of the fan and filter.
There is no "ideal" amount of pressure in the case of a desktop PC. Whatever flow rate is enough to cycle the air out of your PC without having the fluid be saturated with heat is good enough.
This flow rate is actually very low, which is why quiet fans are prominent in PC building.
>>53597733
Your mom's mouth
>>53597471
I wish half of you went to school.
>>53597733
Pressure is the outward force caused by air molecules moving around and smashing against each other. More molecules per cubic cm means more pressure.
A fan forces molecules from one side to another, causing a lack of molecule (low pressure) on one side and an excess of molecules on the other side (high pressure).
Then you have to learn that everything will try to go back to the equilibrium state. The lack of molecules on one side causes molecules to move towards that low pressure. Excess of molecules will escape to other places with less molecules, thus decreasing pressure.
>>53597852
Actually it's better to have positive pressure in your case to avoid dust.
Air will only come in through the fans where you'll have dust filters, and not through every possible hole in the case
>>53598641
I think that is what he was saying. With the flow rate being so low I cant imagine there is much of a pressure difference from relative pressure though. Maybe it only takes a little bit for dust to accumulate
