Start from the inside and you can see the 4ft seams. Then you will be able to see the brads shot into the rafters from there. Once you have figured out where you want it square out the spot and cut the ceiling out. Then in each corner drill thru the roof. Go up and square it out leaving 1 inch excess so you don't hit the rafter. Double check everything, adjust saw blade so you just cut wood. Cut where your drill holes are. Now you can frame it in if you want and get your wire ran.
I am thinking you are talking about a Fantastic fan. if not Sorry.
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