I took the Hunter Original Fan out of our old house and installed it in the Radio Room. A bit of a chore as it is heavy, mounts differently than normal fans and there was no box in the ceiling.
First to find the center of the room:
Next to make the hole. The original builder decided to put a wall scone in instead of a ceiling light. Later that was removed and the box was plastered over. But that’s another story.
Then a metal pancake box screwed to the joist. BTW, I found the layout mark on the joist for where the ceiling light was originally planned to be located. Notice the u-bolt fan mount. It is lag screwed into the joist. I had to drill through the electrical box for the lag screws.