Hon&Guan 6 Inch Axial Wall Exhaust Fan 116 CFM 110V with Led Light B-Type

This is an awesome, quite little fan. For its price, it is surely durable. I like that it is made of durable metal and can plug into the wall, no usb charging. I also like the mounts that come with it; one could do a great many things with this well-designed fan. Though I use it for small soldering projects, it could easily be mounted into a wall or some form of a boxed heating structure to make a heater (check online projects to do so safely).
My one suggestion, if you are after one of the best small fans on the market and choose this one, be sure to get the control knob when you buy it. There is no reason to have both power cords, really, and, chances are, if you buy it with out the control cord, you will end up wanting it, anyway. The control cord works great. Remember to pay attention to the airflow arrow on the part of the fan where the cord plugs in 'before' installation. This is one nice fan. :)

So we have a condo, and our main bathroom has a window but NOT a fan... and we take hot showers, not lukewarm showers. Even with the door and single small window open during and for hours after the shower, the walls were crying from the steam, and some mold spots were beginning to form on the ceiling. To get a proper fan installed, we would need to get HOA permission to add a vent to the exterior of the building (HUGE headache). This fan is small enough to fit on the tiny ledge of the window, but still powerful enough to make a very noticeable difference in the level of steam in the room during and after the shower. The walls didnt cry anymore! One word of caution- I did not install the protective screen that prevents the blades from being damaged (or damaging you) and I will tell you from experience- use the protective screens!! The extension cord dragged the spinning fan off the ledge and I caught it before it fell- but it took a chunk out of my finger for my trouble. Be Safe!