I'm a indoor noob trying to set up a roughly 4' by 2' by 5' cab, so about 40 cubic feet. From what I read I'll need about 100 cfm. I'm looking at a 4" vivosun 195 cfm fan on ebay and a speed controller. Does anybody have any experience with this fan? I also need a filter that can deal with 2 or 3 of Mephisto's strongest smelling strains. My budget is limited so I can't afford to buy junk and go back and buy what I really needed to start with. I'm ok with a diy filter as long as it works good and isn't the size of a 5 gallon bucket. I don't have a clue on this so I need advice from anyone who can help me.