i have a space thats 2 1/2' x 2' x 4 1/2' for my flowering it has a 80 cfm exhaust fan through the top and no stand alone intake yet, the intake vacumes from the veg. area which has 50 cfm intake on a timer but no exhaust yet. i want a 400 watt but i dont want to grind, yes grind, no bit but...