Centrifugal Exhaust Fan, 118mm

thingiverse

I designed this DIY fan to replace the inadequate bathroom exhaust fan in my apartment with something better. It's meant to be printed flat side down, but the flat side is actually the "top" portion of the fan. In my setup, the fan is powered by a small AC motor hidden underneath, and the top part is lifted up to fit snugly into an exhaust vent in the ceiling. The fan STL as designed should spin clockwise when viewed from the flat side (the top). The reverse blade design is likely to be efficient in a housing with high static air pressure, although I'm still unsure if the center of the blades need to be angled more to effectively scoop up intake air. Edit: The current version is V2, and the blades have been tweaked to "scoop" more efficiently.