I have a small problem, not really a big one, but I am not sure what to do here. I have a case fan (intake) on the front of my case, and two case fans on the rear of the case (exhaust). I have a blowhole in the top of my case also, but no fan installed. I have a fan laying around that I would like to put into my case. My question is is should I put the case fan in the case as intake? or exhaust? or just leave it out? I read somewhere that having too many exhaust fans causes like a vacuum that actually sucks in all the dust into your case, is this true? But could someone please help me out here, just want to get it all straightened out. Thanks.