Should i set the fan to blow into the case or draw air out?

[JEDI]

i bought a case and a separate fan. where's the best place to put that fan? in the front or back of the case?

and do i blow air into the case or draw it out?

thx

 

[Zim Hosein]

XFILE, my suggestion would be to add the fan to the rear and have it blow out if this seperate fan is the only fan in addition to the one in the power supply. If it is the only case fan, you might want to purchase an addition fan for the front of the case to draw cool air in and have nice airflow. Hope this helps

 

[JEDI]

yep, i only have that case fan and the powersupply fan.

since the PS fan blows out, why not put the case fan in the front of the case, and have it blow in to create a nice air flow?

 

[Zim Hosein]

Originally posted by: XFILE
yep, i only have that case fan and the powersupply fan.

since the PS fan blows out, why not put the case fan in the front of the case, and have it blow in to create a nice air flow?

XFILE, the reason I suggested it as a rear fan blowing out, is that there is a lot of heat around your CPU that w/o somewhere to go will be worse than bringing in fresh cool air just into your cause and hoping th PS fan will take care of it. Hope this helps

 

[JEDI]

but the cpu has it's own fan blowing the heat. if i'm blowing fresh air into the case, wouldn't that mix and dilute the hot air around the cpu?

or are u saying that putting the fan in the back of the case and drawing the air out is better?

 

[techwanabe]

Originally posted by: XFILE
but the cpu has it's own fan blowing the heat. if i'm blowing fresh air into the case, wouldn't that mix and dilute the hot air around the cpu?

or are u saying that putting the fan in the back of the case and drawing the air out is better?

That appears to be the case from the following links and article:

I found this statement in an article:

If you have just a single case fan, PSU fan and CPU fan, then you should place the case fan at the back of the case, blowing air out. The
hot air from your CPU HSF rises up towards the top of the case, so the case fan at the back should suck this hot air out away from the HSF. Having the fan at the back of the case causes something called pressure variation. There is a difference between the pressure inside the case and the pressure outside of the case. If you have lots of air blowing out, then the pressure inside the case will be lower than that outside of it. This will cause air to be sucked into the case via any gaps.

This is what we want, as cool (hopefully) air from outside of the case will be sucked in any gaps, and hot air from inside the case will be getting blown out.

Depending on the amount of air that your case is exhausting, this can result in a 1-5 oC decrease in case and CPU temperature. By now, if your CPU was originally running at around 50 oC, it should be down into the mid 40s, which is a much more respectable temperature.

Since I'm low tech and don't know how to linkify, cut and past the following:


http://www.tweakers.com.au/articles/cooling/casecooling_part1/page1.asp and

http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/cooling_guide.pdf