I am confused
"Surprisingly, even with two times as many intake fans as its competition, Corsair’s Obsidian 550D still runs slightly hotter. Opening the optional vents only has a minimal effect on its temperature."
The 550D only has 3 fans default while the Gigabyte has 6 and the Fractal has 2 (that are larger as well). How is that twice as many intake fans as its competition? The Gigabyte can have the top and front as intake and the front and rear as exhaust. In addition, there is no mention of the bottom fan position available.
When doing the tests you also make note of there being little/no difference with the vents off, did you use any fans there? I believe the point of the vents as you call them are for fans since it otherwise ruins airflow (as indicated by a rise in temperature). Also, is that with all vents off or just some? Personally, I use the front and side vent panels on and leave the top one off (as I have 2 additional fans there for exhaust). Just seems a little strange that these features are here to give choice but those choices arent tested except for the silly fan controller.