Carbon filter and fan setup for GL 40

Hey all,

Doing a small closet grow with one plant in the GL 40. I'm also using the Sun System 150w HPS. What type of carbon filter + fan setup can I use for the out-take? I'm already using one 4" duct booster fan for the intake at the bottom. I was looking at this but i'm not sure if it's going to take up a lot of my height space for the light:

http://www.ebay.com/itm/390515504802

Thanks for the help!

Here is a pic of the setup:

20130304_145121.jpg

^ that's as high as I can put the light, so i'd like to be able to fit the carbon filter + fan into that space when the light is at it's max height in the tent.

(bag-seed, looks sativa, 2'ish weeks into flower, it's a girl)
 
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