i plan on doing something like your triangle design. i think that would be best, because you are drawing "cool" air from the outside and exhausting it out the case.
the last one (box) set up, i think would cause some air turbulance with the 120 mm fans blowing into a wall. in other words "dead air" or air trying to blow back into the 120mm fans.
take a fan and blow it towards a wall, the air bounces off and rides along the wall.
just my 2 cents
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