I have a bathroom extractor fan that has gone bad, so I need to replace it. If possible, I would like to just replace the motor, rather than opening up the ceiling to put in a whole new enclosure. The problem is, I don't know how to find a replacement. Maybe someone here can identify this beast? It is an older fan in an apartment in Canada, Winnipeg. Here are a few pictures: The cover says "Nutone", but I can't get any hits by Googling the partial text visible on the back of the fan. Any advice would be appreciated!