There have been a few small fans in the micro forum that used 6mm and 7mm pager motors but just one offs.
As far as I know there is nothing smaller than 30mm commercially available at this time.
Brushless motors smaller than 12mm diameter are very very expensive but they are available, I'm not sure they would be suitable for a fan though.
I've experimented with both smaller fans and motors. 30mm seams a bit of a barrier. It's very hard to get usable thrust at diameters smaller than 30mm.
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