Sup yall I been experimenting and resesrching for along time and im actually ready to spend alittle more money on a grow box. Either I build one , or I buy one on ebay for 150$. My main question is how much air is actually needed for a few plants, I see people putting 1 pc fan goin in and 1 going out but IS that really enough? Also if I dont use a pc fan for the carbon filter is there anything else cost efficient? I just want to know what and how it works, please