How are your fans configured? Looks like 2 intake on the front and 3 exhaust on top and back. You ideally want more intake than exhaust so that your case is naturally exhausting air out rather than sucking it in due to pressure differences. Also allows you to control where air comes in, preferably thru dust filters. Does the 912 have a side fan slot? If so toss one of the top exhaust on there as intake.