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I remember someone had the set up on here. I am going to do the same thing. What you want to do is mount the carbon filter above the Cool Tube, run ducting from the filter to one side of the Cool Tube. Now attach ducting to the other side of the Cool Tube and run it out of the tent. Then attach that ducting to the intake on your fan. You will be pulling through your air through your filter and pulling the heat away from the light at the same time. Just have a office fan circulating the air inside the room on top of the other with its function.
I would make it to where the air pulls through the filter first, then through the tube, and out the tent. I think filters are built to where they have to be at the end of the ducting but I may be wrong. Also I think excessive heat would be bad for the filter.