Forge Blower for your DIY blacksmithing forge.
Designed to fit a 400 size dc brushed motor. (shaft size 2.3mm, mounting holes 16mm)
You can build it together left or right, depending on your needs. Just use the appropriate vent thing.
The mount should fit on a 3/4" pipe, though I had to fiddle around until it fitted.
Use M3 screws and maybe some glue to seal things up.