The most common setup for cases is to intake air from the bottom front and exhausted out the top and back. The airflow can be directed into the case from a few different ways as long as you remember rules 1 & 2 above. Rule #2 - Heat naturally rises so to remove heat the easiest and most efficient way it is best to draw air in from the cases lowest points and exhaust it from the cases highest points. another thing to note is noise, a fan is always louder when mounted onto some type of a stamped metal grill then with it just mounted over an open hole, sometimes its way louder. Redrill all those small holes in the vents at the back of the case with a 3/16" drill bit to increase air from that spot and if you have the larger hexagon shaped holes that are already larger then it should be ok the way it is. the newer and larger openings and fan grill designed cutouts are ok but if you aren't sure then test them by feeling the airflow with the fan outside the case then in the case and if its unrestricted you shouldn't be able to tell the difference. cutting out the opening for the fan can increase airflow by as much as 70% more then the fan trying to get air to pass thru the holes. Also always cut out a hole where you mount a fan, never mount it behind those predrilled "cheese grater" holes for fans or you won’t get any kind of good airflow.
Rule #1 - Airflow is best if it can flow in one direction only and it is always better off (stays stronger) flowing in a straight line of sight direction if possible.
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