80mm Fan Adapter to 2" ID Hose

A very smooth transition 80 mm fan adapter, to attach a 2" I.D. hose, it has an internal cone to help reduce turbulence, print two if you want to place fan inline, I'm going to use it to make my own Tractor cab defroster, I haven't done the numbers but it might be able to scale to different fan sizes. I designed this file in Mastercam V8.

Note: I repaired the model into one contiguous solid, Added new STL. 12/31/2019