NeO-
Are you the One? Never mind.
Is your power supply fan blowing outward? If it is, you may be fine with just the one fan in the lower front of the case blowing inward. It does not really matter that the lower fan is not blowing directly on anything significant. The point is to mix the air by creating turbulence and to change out the air quick enough to keep it cool inside. Having a large case with a lot of air volume is to your advantage. Also, try to arrange your ribbon cables so that they create as little obstruction to the air flow as possible.
If your power supply has a fan that blows inward, you can take the case off the PS and flip the fan over to reverse the flow. Otherwise, you might need to add an exhaust fan to the upper rear of the case.
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