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i have a box 80cmx80cmx160cm....i am buying new fans and dont now what to buy...i need one input and output fan...what is the best fan for my box??? and i have a carbon filter on output fan... Is the input fan more powerfull then the output???

HI EVERYONE...i just started my firs grow 1 and a half months ago...I"m now at 2 weeks of flowering....wupiii i am so exited...