1 x 140mm rear fan
1 x 200mm top fan
1 x 200mm side fan
1 x 230mm front red LED on/ off fan
you've only got room for a 200mm fan on the top to add in, there are 2 vga fans you can add, one's a 120mm and an 80mm and they fit on extra parts that are included with the case i think. I'm not really sure as I don't have the case, but one goes on a VGA Holder and the other on a VGA Fan Cover. As far as fans go, it's kind of up to you. if you want better airflow get a higher cfm fan, but higher cfm = higher dba. the fans in there are 19dba and 75cfm. so any of the ones on newegg will be an upgrade. you just get to choose a color
Cooler Master HAF-X (RC-942-KKN1) Full Tower Case Preview - Accessories and Documentation :: TweakTown USA Edition
that's got all the info of where you can plop extra fans.
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