I wish I knew a thermodynamic engineer. These just might make him loose his mind.
There should be more exhaust than intake, the cool air expands from heat before leaving. However if intake and exhaust are the same size would it force the hot air to circulate a little longer before leaving? Or possibly smolders itself.
I would think a little air from the 3 intakes would burn more even than from only one "side".
Just a thought