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So, I've thought about what to do and went ahead and bought an exact replica of my PC fan. What I did was:
1) Take the PC fan and core it out (i.e. remove the fan, but keep the square)
2) Mine has a hole on all four corners, so I am able to insert a bolt inside it. However, we want to be sure the pantyhose is covering it up and sealed as well... so tape it up around the sides, try to keep the airways open for the fan to blow through inside the circle.
3) Before sealing up the pantycloth with duct tape on the 2nd side, fill it up with activated carbon.
4) Insert a nail through the tape build-up where the hole is on all four corners, you want this hole free.
You now have a PC fan that you can just attach to another PC fan. In my case, I'm going to put one PC fan with the fan, inside and there's a layer (the box itself), then this newly built PC fan on the outside. That way, air blowing out just passes through the filter.
I haven't tested this out completely with airtight seals, but I put the fan against the blowing PC fan and felt a faint freeze through it, some air was getting pushed back inside too so I found that interesting, and of course it leaked a bit.
Bolts should do the trick - and if not, duct tape will. Going to try this out when I start and let you know if this works. I mean, the proof of concept is there really from what I read from your thread... the only difference is that pocket of air before it goes through the filter, which mine doesn't have.
So it's consistent with the "layered" idea. ;-)
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