False Ceiling and Fan
I have done this in the past various ways from a pipe flange on the structure above the ceiling to making a wooden frame work. I am not sure how long the Special Fan Boxes have been available but from what I can tell it would have made it ALOT easier to do. And with less safety questions. I would recommend researching a Fan box made for this type of application such as the (Pass and Seymour item number 15010) this looks to me like it could be a fairly easy solution
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Mgmopar
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