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CASE FAN DIRECTION????? PLS HELP!!!

D

dyoo

Member
hey everybody, i need some help!

i just bought a sunon 80mm case fan to install on the back of my case...but my question is this: is the air supposed to blow INTO the case or OUT of the case? i don't know which direction the fan is supposed to be installed and i don't know whether or not i'm supposed to bring air into the case or have it all sucked out and blown out of the case...

what are the pros/cons of air blowing INTO and OUT of the case???

thx AT'ers!!! 😀
 
Typically, good air flow requires air coming in the front of the case and exiting the rear, so you should have it blowing out (unless there's some odd set up). This would be different if your PSU blows in, instead of out, but this design should be avoided if you want good air flow.
 
Best case senario *pun intended* is to have an intake fan lower front, and an exhaust fan upper back. If you only have one fan, put it in the lower front as an intake, your psu will be pulling some of the hot air out as an exhaust fan.
 
Not only is it a question of air-flow, but a question of basic thermal-dynamics.

There are some rudamentary rules-of-thumb you should keep in mind when cooling your case:

* - Hot air rises. Thus, be sure and have you exhaust fans higher than your intake fans.
(IE. intake fans down in-front, and exhaust fans on-top and in-back)

* - Thermal-loops exist between/underneath harddrives. Unless you have DIRECT air-flow blowing on your HDDs, the life of the harddrive will be shortened.

* - Thermal-loops ALSO exist underneath video cards.
More times than none, people forget to provide proper circulation to their video's GPU and memory. Active cooling on the GPU simply is not enough. One way to solve this is(provided you have the PCI slot under the vid. card vacant) remove the PCI slot "cover" from the back of your case. This allows cool air that enters from your case's intake fan to blow past your video card, and allows the warm air to exit efficiently, thus preventing your video card from turning into a major 'hot-spot'

If you truly are worried about the ambient temperature inside your case, keep one thing in mind. The best solution is to apply "positive" air-flow pressure to it. What this means is, to have more air entering the case than there is exiting. Higher air-pressure provides greater cooling than low air-pressure. 😉
 
The intake fans and exhaust fans are the same right (its just one is used as intake and one is used as exhaust)? In other words..I don't have to buy an intake specific fan and exhaust specific fan right?
 
yea intake/exhaust fans are exactly the same...it just depends on where u place them....a case fan placed in the front is called the intake fan and a case fan placed in the back is called the exhaust fan
 
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