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purplehaze11 Reviewed by purplehaze11 on . GHETTO $35 100 CFM fan with Carbon Filter I recently made a fan for my new grow box which is about 3'x6'x5', Optimum CFM from the calculator at: CFM Calc is around 100 cfm. With this in mind i made a trip down to home depot on concocted a fan and filter for under $35. Here it is: 2 - NuTone 50cfm fans $25.76 Fan Link 1 - Carbon filter = $9.97 Duct tape extension cord scrap plywood or plastic or cardboard(not fire safe) Take the two fans with the exhaust outlets pointing up but them together to make a triangle. Rating: 5