Fan direction
- Thread starter kingoat
- Start date
Depends on where the fan is front-back or side of case or are you talking about the processor fan
Out
Blowing out. Back should be out, front bottom in, side in or out but I always set my side ones intake and top should be out.
Da Mail Man
Active Member
...can i stick my 2 cents in?...
....i have my fans blowing in...reason being is that all the components on the board throw off some measure of heat and heat for the most part takes out components......
....with air blowing in, you have cool air coming inside the case displacing hot air...the pressure in the case will build because of the forced air INPUT and the hot air will EXIT through all/any holes/ports in the case resulting in cooler operation....
....now, this may accellerate the amount of dust in the case but that can be easily removed....
....it wil be argued by some that the EXPULSION of air by fans EXTRACTING air FROM the case will cause a "low pressure zone" inside the case and thusly, the case will draw cooler air in from all the holes in the case....
....however, with fans blowing onto (IN) and in the direction of the boards/ram/hard drive/video cards/etc will cause a "chill factor" so-to-speak and keep eveything cooler then if fans were only extracting air from the inside to the out....
....those of you whom have spent a winter in snow, tell me if it is colder standing in 10* with no wind or 10* with a 30mph wind......
....i have my fans blowing in...reason being is that all the components on the board throw off some measure of heat and heat for the most part takes out components......
....with air blowing in, you have cool air coming inside the case displacing hot air...the pressure in the case will build because of the forced air INPUT and the hot air will EXIT through all/any holes/ports in the case resulting in cooler operation....
....now, this may accellerate the amount of dust in the case but that can be easily removed....
....it wil be argued by some that the EXPULSION of air by fans EXTRACTING air FROM the case will cause a "low pressure zone" inside the case and thusly, the case will draw cooler air in from all the holes in the case....
....however, with fans blowing onto (IN) and in the direction of the boards/ram/hard drive/video cards/etc will cause a "chill factor" so-to-speak and keep eveything cooler then if fans were only extracting air from the inside to the out....
....those of you whom have spent a winter in snow, tell me if it is colder standing in 10* with no wind or 10* with a 30mph wind......
for me : my CPU fan is right next to the case fanin the back. when blowing out it lowers the RPM by 100-250. when i just stop it it goes back to regular. the case fan is sucking air out (probably more than the CPU fan) do it lowered myCPU fan speed. when blowing in i got 50 -125 RPM faster .
Da Mail Man
Active Member
...so, let me understand this...you have a case fan sucking air out and you have a cpu fan very close to that sucking air onto and down into the cpu heatsink...sounds to me as if you are making the cpu fan work harder to grab air for the cpu and i would also assume that the case fan is larger and has a higher cfm then the cpu fan..seems the two are fighting each other...
diduknowthat
formerly liuliuboy
Generally you want to create air flow in the case. So, the front fan should blow in, the back fan should blow out. The top fan should blow out and the side fan can be either.
Da Mail Man
Active Member
..part of the reduction of "pressure" and hot air removal from inside the case will be accomplished by the power supply fan as it too draws air from the inside of the case...the cooler the air inside of the case, the cooler the temp of the air that will pass into and exit the power supply helping it to run cooler.......i still stand by my "chill factor" example...a fan blowing air in from the front and exiting the back will move hot air however, i think mine would be more efficient in keeping the components cooler and that heat exhausted as mentioned above....
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If you have all your fans blowing in and just your P/S blowing out your creating a slight amout of pressure inside the case which is not good for cooling. You need the same amount of air being sucked in as being pushed out, from bottom in to top out to create a good cool air flow
Da Mail Man
Active Member
...i respectfully disagree..one can hold their hand between the motherboard and the fan or fan and the hard drive and can FEEL the air velocity hitting it (i.e. chill factor). the movement of air through the case in itself is not bad, i'm just saying that mine is more effective...
if you were to run a hard drive in a case as has been described with a fan at the front of the case pulling in and a fan at the rear pulling out, reach in and feel your hard drive...warm is it not?...sure it is....
....now, fasten a fan so that it blows directly on the hard drive and now feel it...hardly warm if not cold....the same thing applies to the mother board, video card etc...
....try it, really, and you will see that i am right....any minute' pressure that builds in the case will be relieved by the draw of the power supply fan as well as relieved by all the case holes......
Oh I respect your opinion but this is how the air flow is suppost to be , with the side fan either way
, with the side fan either way
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Da Mail Man
Active Member
Oh I respect your opinion but this is how the air flow is suppost to be
........i disagree....seeing and feeling is believing.....hard drive and cpu temps can't be wrong after doing the comparisons........we each have an opinion and i feel mine is, well, you know.......grin......good luck....(can't beat that chill factor" example though!)
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Da Mail Man
Active Member
Oh I respect your opinion but this is how the air flow is suppost to be
......nahhhh.......(see post #15)
Da Mail Man
Active Member
thought i had a double post there for a minute!
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