That's an interesting setup you have with the cooltube intake coming from outside. Do you have another intake/exhaust for the growroom, or is it a sealed room?

I'm asking because the plants will need either fresh air or CO2 (if you go with the sealed room), and because I have an idea for you. See if this makes sense: Keep everything like it is, but put a Y-duct splitter just before your fan. Then, you can attach a carbon filter to the open slot. That way, you can run fresh air through the cooltube AND suck out hot/stinky air from the growspace through the carbon filter. That way you solve a couple problems, and no smell. My fan is only 220 cfm and takes care of both my carbon filter exhaust and cooltube.

I see you ran out of money already ... but I was thinking the carbon filter would be the next thing on your shopping list, seems like you solved the ducting problem:jointsmile: