Well im gonna be running a DIY prefilter I made. 8>6 So im hoping the 6" axial is good enough for my 2 panty house drag. + carbon ac filter. I live with the store i linked so im picking thos eup this week, 2 4inches for intake and 1 6 inch for exhaust. in a GL80L 3x5x7 tent with 2 150w hps sun...