OK so I'm not new to growing but I am new to using hid lights and tent. OK so I got the dark room.dr90 3x3x6. Using 400w cool tube and 6" inline with.scrubber 440 cfm for both. I need to know how to properly setup my fan and scrubber. Hydro store says to have it push the air through cool tube then filter but others have said to have it sucking and not blowing. Not 100 percent sure so I would like to know the best way and not ruin fan