Do I need my rear exhaust fan? I am water cooling a 6700k and a GTX 1080 with a 360mm rad in the top of my case exhausting air and a 120mm rad on the bottom pulling in air. I also have 3 140mm intakes on the front of my case, the problem is - I can't get the fittings in the top radiatior with the rear exhaust fan installed. Is the rear exhaust fan necessary with this setup?