might as well try here- I've decided to replace a ceiling fan (I've replaced every light fixture in my house other than fans, which I've been dreading, but the time has come). I went ahead and took off the cover on the top of my current fan and found this
current fan is secured to a piece of plywood with a what looks like a D ring. Looks like a simple swap out is going to turn into a chore (my guess is there is no joist above- hence the d ring) - I'm thinking put out a hole in the plywood, put a brace above in between the two joists, pancake box then new fan- what should have taken five minutes is now going to be a fun project