This is fantastic and I appreciate that it scales well on the server side.
Ai scraping is a scourge and I would love to know the collective amount of power wasted due to the necessity of countermeasures like this and add this to the total wasted by ai.
The bearings are much sturdier as the fan is bolted to the motor, and the motor is a generic one meant to be used in any orientation. I personally bought [this](iLIVING 20" Wall Mounted Shutter… https://www.amazon.com/dp/B0BVY8VCNZ) one for my house to cool it in the summer and at half power, every open window in the house has a stiff breeze.
Box fan bearings are not typically designed to run in that orientation. It will probably run for a while before failing prematurely. Might make it a couple months or just a few weeks.
This is a much more robust fan and they come in various sizes to better fit your opening. They move a lot more air, and many styles come with a thermostat and speed controller. Sorry for the Amazon link, this is just the general style: https://a.co/d/bLeBCeD
To answer your question, yes that PSU looks like it should work. I’m not sure I would use this PSU for my NAS due to the quality of the manufacturer being unknown, but generally it should be fine so long as it is not mission critical.
Also if you have access to a 3d printer, there are some great designs for external drive cages to keep them safe and cool.