I purchased a 4x4x6.5 grow tent and Im looking at the materials I need for ventilation. New 4x4 x 6.5 HYDROPONIC GROW TENT HYDRO BOX HUT - eBay (item 360062134499 end time Jun-22-08 23:00:00 PDT) There is a 4" flange outlet at the top back of the tent and two 6" flange outlets on the top and one on each side. To utilize these, I would assume I need the following (please provide your opinions): As the cubic feet is 20.8 (4x4x6.5 = 104 /5 = 20.8), I dont need much. List: 1 x GrowBright 4" Inline Fan & Elf Carbon Filter Combo High Tech Garden Supply - I will also use an inline fan for my ballast. - I already have a 6" oscillating fan. - I need to find a light proof fan to install at the bottom for air intake. Feedback is much appreciated!