Need a solution for odor control

Hey everyone, I was planning on building a small grow box for 2 plants that will be sitting in my closet, and I was planning on using PC fans for ventilation since its a small box.  Unfortunately, I've hit a snag in my plan.  After sharing my design over on RIU, someone over there told me that PC fans don't do well blowing through carbon filters because they're not made for back pressure.  My original plans for odor control were to either use these cut to size carbon filters from home depot, or make DIY carbon filters from a thread here on GC using mesh pencil cups and activated carbon for aquariums.  Does anyone know of a good and cheap substitute for odor control that would work for a small grow box?

 

How would I do that if I don't plan on ducting at all? I found some small carbon scrubbers, but would those even be too big for such a small box?

 

I don't have a hood either, this box is pretty small and I'm using CFL's.  How would I even hook it up to my box and how do I have it shoot the clean air at the ceiling?

 

Yeah but this box is so small that I probably can't hook up an inline fan to it. Do you know anything about PC fans, there's a DIY car on scrubber made out of pencil cups and activated carbon for aquariums, but I need to find one with the highest air pressure rating. The highest I've found is 3.1mm and I don't know if that's enough or not.