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Sumo
I think that was me. As I said then, standard bathroom fans are close to useless. Get a centrifugal one between the joists. My original post said more, if you can find it - I have no idea how to search my posts on this newfangled forum...
FWIW, extraction rate should be based on the size of room (at least it is for kitchen extractors, I don't see why bathroom extractors would be any different).