Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4077476.
This is not the common 5015 blower. This is a 5020 blower (squirrel-cage radial fan) with dual intakes and a much bigger outlet that is significantly quieter than the 5015 blowers.
I've been using this in some custom designs and needed the model for FreeCAD. I'm uploading the STL as I think it's required to publish a part, and including a STEP file which should work for any CAD package in case anyone else finds this useful.
I couldn't find a decent model of this on any site, so decided to model it, myself. I got carried away and made it more detailed than needed. The biggest problem was figuring out what dimensions were accurate for the mounting hole location and orientation, as I found many conflicting and incomplete drawings online. I took many measurements directly and compared those to narrow down the field. I finally printed a 1mm slice of it and laid it up against my fan and it's a near perfect match.