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Old 11-07-2005, 02:36 AM   #1
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Default Which way do Fans blow?

I am about to upgrade and add some fans to my system and I was wondering how it worked. Fans like my CPU and Vid Card fan, do those blow toward the chip or do they take air away from the chip? I tried sticking my hand infront of the chips but I can't tell where the air is coming from.

Furthermore, cases that have fans mounted on walls or top, is that like an exhaust system or is it actually sucking air in? like so: http://lib.store.yahoo.net/lib/xoxide/clear5.jpg

And on a regular computer with only the fans from the psu, cpu, vid card, the air comes in from where? and then gets flushed out the psu right?

Thanks, just trying to understand the air flow before I go upgrade/add fans.
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Old 11-07-2005, 02:49 AM   #2
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Fans will always blow toward the chip. Usually only case fans will blow outward, taking the air out of the tower.
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Old 11-07-2005, 03:10 AM   #3
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well if you look on the fan, there usually are arrows pointing at the way the fan spins and the way air gets blown.

On the computer on the link, I would guess that the two front fans are sucking, the one back is blowing out. The top is blowing out, and the two sides i'm not sure about.
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Old 11-07-2005, 03:30 AM   #4
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Take for example my case: Aspire XNavigator...front fan sucking in, two rear fan blowing out, top exhaust, psu fans blowing out and large side fan blowing out. There is a big misconception that the side fan should be blowing"in" and some people change it because it will blow towards the cpu and "must be better"WRONG" The warm air has to be moved out,otherwise you're only moving warm air around. My cpu(Prescott) runs below 30c so go figure???
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Old 11-09-2005, 09:02 PM   #5
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Another way to tell is to look at the fan and see where all the dust is collecting. The side that has the greater amount of dust on it can help you determind what way it spins. it's hard to explain but if u check it out you'll know what i mean.

if you happen to not have any dust on ur fans... well then idk lol
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Old 11-09-2005, 09:58 PM   #6
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Quote:
Fans will always blow toward the chip. Usually only case fans will blow outward, taking the air out of the tower.
Usually, but not always.
Quote:
Furthermore, cases that have fans mounted on walls or top, is that like an exhaust system or is it actually sucking air in?
Both, generally the setup is intake fans on the front/bottom and exhaust fans near the rear/top.
Quote:
There is a big misconception that the side fan should be blowing"in" and some people change it because it will blow towards the cpu and "must be better"WRONG" The warm air has to be moved out,otherwise you're only moving warm air around. My cpu(Prescott) runs below 30c so go figure???
That's kind of a case by case situation. True, there are setups that will benefit from an exhaust side fan, but the opposite is also true.
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Old 11-09-2005, 10:23 PM   #7
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I remember what you said about putting your hand in front of the fan to see which way the wind was going. If you couldn't feel the wind then either it's going into the computer or the fan is too slow and you need to clean it
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Old 11-09-2005, 10:31 PM   #8
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why dont you check which way the fans are running in it now! its the easiest way I could think off!yeti is right the fans on the rear are in alot of cases blowing out air! what are you trying to change around
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Old 11-09-2005, 11:57 PM   #9
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he doesn't want the fans to make noise and someone else was giving him suggestions on getting smaller fans or removing ones that could be replaced by pipes... i think you should thoroughly examine the fans to make sure that there is nothing hitting against it and making the sound... or..... maybe the fan was installed backwards... try turning it the other way
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Old 11-10-2005, 02:46 PM   #10
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is that your case? if so is that a sunbeam case? i have the same case but i can only fit 4fans + the psu fan...
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