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Old 04-06-2006, 03:03 PM   #1
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Default CPU Fan Direction

On a cpu heat-sink fan, like this one for example:

Do the fans generally blow air INTO the heat sink, or draw the air away from it?
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Old 04-06-2006, 03:12 PM   #2
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Default Re: CPU Fan Direction

They blow air into the heatsink
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Old 04-06-2006, 03:39 PM   #3
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Default Re: CPU Fan Direction

By default, it should be blowing into the fins of the heatsink..
Sometimes, with some easy modification to the fan (flipping over), you can set it to blow out but its not as productive.


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Old 04-06-2006, 04:06 PM   #4
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Default Re: CPU Fan Direction

You can tell by how the fins on the fan are bent.
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Old 04-06-2006, 05:20 PM   #5
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Default Re: CPU Fan Direction

CPU fans always blow air into a heatsink. This way you have the coldest air passing through to dissipate the most amount of heat. Which in return the air exits the sides of the heatsink and cools you mobo and RAM down.
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Old 04-06-2006, 05:25 PM   #6
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Default Re: CPU Fan Direction

yea also on normal fans there are arrows pointing how it spins and how the air flows
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Old 04-06-2006, 05:42 PM   #7
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Default Re: CPU Fan Direction

Yeah, always down. Never known an outtake on a heatsink, suppose it wouldnt work, too much heat...
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Old 04-06-2006, 05:50 PM   #8
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Default Re: CPU Fan Direction

Actually, my old Dell pulled air from the heatsink. It had a metal heatsink on the CPU and a case fan mounted on the back pulling air out. Only fan in that thing, no telling what the temperatures were like... It still works though! Though now I have a fan on the heatsink, haha.
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Old 04-06-2006, 05:55 PM   #9
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Default Re: CPU Fan Direction

Yeah, Dell uses passive cooling on most of there systems. It just pulls cold air from the side over the heatsink and blows the hot air out the back. I have seen some passive cpu coolers that have a fan on each side. One pushing cold air in and one pulling the hot air out.
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Old 04-06-2006, 09:36 PM   #10
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Default Re: CPU Fan Direction

some people have gotten better results on a XP-120 with the fan blowing up instead of down. Its all about experimentation. And im using the same heatsink, Zalman 7000B, but a different fan. I took the fan out and modded it.
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