120 mm fan to 100 mm (external) diameter pipe adapter for solder fume extraction

thingiverse

This is an adapter I created to utilize an old 120 mm fan as a solder fume extractor. The pipe measures 100 mm externally, with an internal diameter of approximately 94 mm. If you wish to connect it to a genuine 100 mm ventilation duct using a connector, you will need to modify the pipe's internal diameter, which should be relatively simple given that I've included the FreeCAD files for this purpose. The holes in the adapter fit tightly around 5 mm nuts or bolts, while accommodating 4 mm fasteners with ease.