Desktop PC case fan question

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I am getting ready to rebuild my gaming PC. I am planning to reuse my case for the build. I am however going to replace the case fans. I have a question about one of the case fans. My build will have three case fans. One will be mounted in the lower front, one in the upper rear, and one at the top of the case. I am aware that the standard method of airflow is for the front fan to suck cool air into the case and that the rear fan is to blow the warm air out of the case. My question is about the top fan. Should I mount the top fan to either suck in cool air from outside the case or for it to blow out warm air from inside the case? The case and fans are listed below. Thanks in advance.

Case Fan

Aerocool Silent Master 200B 76.0 CFM 200mm Fan
$20.98 Buy

Aerocool Silent Master 200B 76.0 CFM 200mm Fan
$20.98 Buy

Aerocool Shark 82.6 CFM 120mm Fan
$10.98 Buy

Case

Corsair 600T Silver ATX Mid Tower Case
 
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Top fan should be an exhaust pointing out. Also note the video card and PSU act as exhausts as they blow out. With all this exhaust it'll tend to pull dust into the case through cracks.

It might be best to only have 1 rear fan instead of 2 to create positive air pressure (more intake then exhast) so it keeps dust out of the case.
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MrNiemo

MrNiemo

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Sep 30, 2016
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I usually have my top fans blowing outward, keeps the dust that settles on top of the case from getting sucked in and blown all over my cpu cooler. If you have 3 case fans total, 2 blowing outward is the way to go. I'd go with the Shark because it has higher CFM and it's cheaper.
 
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gondo

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Apr 20, 2004
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Top fan should be an exhaust pointing out. Also note the video card and PSU act as exhausts as they blow out. With all this exhaust it'll tend to pull dust into the case through cracks.

It might be best to only have 1 rear fan instead of 2 to create positive air pressure (more intake then exhast) so it keeps dust out of the case.
 
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