Iamtreehigh
Well-Known Member
https://www.rollitup.org/grow-journals/221652-jigfreshs-grow-2-vertical-scrog.htmltjizzle
I doubt a duct fan has a chance in hell by itself, but if you bought a cooltube or made one from a couple of candle chimneys and ducted it right you'd probably be ok. I have actually seen a DIY cooltube on a 1k that was just two of the candle chimneys stacked, it's a guy here doing a vertical grow but I don't have a link for you.
I think that may be the one you're talking about