I wanted to leave that for air when I get my new parts... I'm leaving out a side fan so I wanted the video card to get some air. the case fans I have are meant for quiet... they don't push a lot of air. it's more "ambient" air that air flow.
Besides... my plexi wasn't that tall I have about an inch of room between the top and bottom that being the main reason.
Dell 4K S2817Q / Logitech Z-680 / Func MS3 Mouse / Corsair K70
NZXT Source 530 / i7-3770K / Corsair H100 / ASRock Z77 Extreme4 / SoundBlaster Recon3d
Samsung 850 PRO 512GB SSD/Seagate 1TB/2TB/WD 2TB
4x4GB Corsair Vengeance 2133 / PNY GTX 980 ti/ Seasonic M12II 850W