I am currently growing with cfl's in my homemade grow box. I plan to flower with about 200 watts of cfl's but my question is, i currently have a 4inch 80 cfm inline duct fan for an exhaust, with 6 2inch intakes around the bottom. My grow box is 3'Wx3'Hx2'D. I know i need a bigger better exhaust fan to help cool things off when the door is shut. How many cfm's should my exhaust be? I plan to try to keep smell under control with the new odor elminating cfl bulbs, but would like to have the option to add a carbon filter if needed. Im not sure if i should get a can fan or squirrel cage fan, or a bigger inline fan. Im willing to spend about 100 dollars on an exhaust fan. Thanks for the help, here are the pics of my grow box.