Google PCI slot fans... but then they don't do much good... Warm air rises, remember your high school days?... trying to get the cool air out isn't always good. Do some research into a new case possibly? something with more than 3 three fans? I have a raidmax storm and love it.. other will tell you different... it's all about what you are willing to spend... Just my 2.5 cents...
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