The file 'Centrifugal Exhaust Fan, 118mm 3D Printer Model' is (stl) file type, size is 247.8KB.
I designed this fan to replace the poorly designed bathroom exhaust fan in my apartment. It is meant to be printed flat side down, however the flat side is the "top" portion of the fan. in my situation the fan is driven from a small AC motor on the underside of the fan, and the top portion is raised to fit into an exhaust vent in the ceiling.
The fan STL as it is should be driven in a clockwise direction when looked at from the flat side (top). The reverse blade design should be fairly efficient in a housing with fairly high static air pressure (am I using that term correctly?) although I'm not sure whether the center of the blades need to be angled more to "scoop" intake air.
Edit: Current version is V2, blades have been "scooped" more
May or may not work well. I've never made a fan before, nor am I an engineer. Just trying things out.
centrifugal_bathroom_fan_v2.stl | 722.5KB |