Take this with a grain of salt as I do not have a kessil to look at, however from what I can see in your photo it appears to be a standard 3 pin pwm fan, like those used in computers. Assuming you can find a replacement that is the same measurement/size fan, it should be as simple as removing the old, installing the new, and plugging the 3 pin plug right were you unplugged the other.
https://www.pchub.com/everflow-f126025sl-server-square-fan-f126025sl-p205612
Here is the site i used to find the measurements for the fan based on model number, The fan appears to be made by Silverstone, and everflow is the series.
https://www.amazon.com/Noctua-60x25...coding=UTF8&psc=1&refRID=QRP8ZMVC9B1T6NNYDBZW
This fan appears to be the same size (60mmx60mmx25mm) and is MUCH higher quality than the silverstone everflow fan. I would give this guy a shot if it was me, on the plus side it should be SILENT as noctua fans are the gold standard in pc building
Again, I have not done this in person, however I work on computers for a living and this would be my first try in replacing the fan. As well, amazon has an amazing return policy so if it doesnt work, send it back