I have a slightly different "DIY fan" project in mind for my stove.
We have a VERY high ceiling above the stove (barn conversion, ceiling at the highest point is about 5m). A stove-top fan would probably work quite well, but I was thinking of something slightly more subtle.
Our flue goes up to the roof inside a large false chimney breast. The downstairs neighbours flue also comes up here and we built the false chimney breast to contain both flues. There is plenty of space available inside and access is pretty easy for now.
I'm thinking about putting a ducted fan in there, with an inlet at the top and an outlet at the bottom. Would be easy enough to have this controlled by a switch, but I'd like to make it a little more sophisticated, with a sensor to detect when the "roof" temperature is higher than the "floor" temperature and turn the fan on appropriately.
Anyone done/heard-of something similar? Engineering degree here, so happy enough to do the electronics from scratch if necessary.