Xigmatek Dark Knight
Neither. It's called a push/pull setup where one fan pushes the air off of the fins and the other pulls it -- This should obviously be moving in the same direction as the rest of the airflow in your case. The cooling difference between one fan and two fans is probably negligible, so if you can't fit two on there there (or don't want to) then I wouldn't worry too much about it.
Silverstone AP-122 Air Penetrator
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