Anything else I should look for besides mold? If it's working well as is (aka no mold), how important is it really to run it through the roof... lol I'd rather avoid another project but who knows.
Well, what I've pieced together is that the bathroom used to have a skylight above the bathtub, but they drywalled over it and patched the hole on the roof (almost fell through the roof, that's how I first found this all out), then inside everything for the skylight is still there. Looks like they had a bad mold problem then but when they removed the sky light they must have installed this fan too which is what actually fixed the problem. I was actually thinking of putting the skylight back in since everything's there except for the top dome... but maybe I should put in the ducting through the roof first... It'd be really nice to do an improvement by choice instead of improve something that's wrong for once.