Thanks resinhead! I will be checking into those as well. I was a bit more worried about the efficiency of my inline fan though. Not sure of the brand and if it has been working like it should, lolThe first response was correct with the footprint size. As a general rule of thumb, you want around 50w psf.
I wouldn't buy a cheap carbon filter. There are two brands that are very reputable. Phresh, and Can. I wouldn't buy anything else, and personally prefer can filters.