120mm fan to 100mm hose air duct adapter
thingiverse
This is an straight forward adaptor for a 120mm PC case fan to a 100mm ventilation hose. I printed it with a 0.4mm nozzle bigger size to 1mm will probably also work. You should use a pretty strong fan since airflow resistance in the hose is pretty big! to fasten the hose i used a cabletie
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