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Airflow of a case fan. Which way?

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Airflow of a case fan. Which way?

Old 07-24-04, 04:47 PM
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Airflow of a case fan. Which way?

Ok, so I'm installing a case fan on my desktop computer. Does airflow come in or go out?
Old 07-24-04, 04:56 PM
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Generally fans in front blow in and fans in back blow out.
Old 07-24-04, 05:02 PM
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Ok, but I don't have a back fan.

So anyway, I have installed the FRONT case fan sucking air in. This is fine, eh?
Old 07-24-04, 05:28 PM
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I think you might want the fan to suck the air out of the case and not into the case. Many years ago I bought a case fan for a computer that had no fan and thought for sure having the fan blow into the case was right. Had it running for awhile and noticed the case was getting hot to the touch so I switched it around to suck the air out and it was fine. This was tower case though with the installed fan in the back.
Old 07-24-04, 05:40 PM
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I was asking a similar question elsewhere, but never got a real answer. I have one fan up front and another on the side, each at about the level of the PCI cards, blowing in. There is one fan in the back blowing out. There are also the PSU fans. Would there be any noticable benefit to adding a second outward back fan? I'm thinking that with the PSU fans being there, it's pretty much already balanced for airflow, and that adding a new outward facing fan might somehow unbalance it.
Old 07-24-04, 06:23 PM
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@ernestrp
Your new fan was probably near the power supply, which has a fan blowing out, so the cool air being brought in was being sucked in by the PSU and expelled without cooling the rest of the computer.
Old 07-24-04, 08:50 PM
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The front fan should be blowing in.
Old 07-25-04, 10:41 AM
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I have two fans blowing in from the front (cooling the HD cage) and two fans blowing out at the back to keep an even airflow direction through the case.

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