I am in the process of renovating my guest bathroom. The
heat/fan/light combo unit looks like it is as old as the house (50
years!). I brought a replacement that I am going to put in, roughly
the same size. The existing unit is mounted to the joists and I have
no access from above. Is is best to just hack it out and try to keep
the hole as close as possible to the current size. Or is it better to
cut a larger hole around it, pull it out, and somehow patch it?
Either way, what is the best way to patch the sheetrock when I am