Most building codes require ceiling fans to be mounted on special fan rated boxes which are made of metal or strong plastic and have deep threaded holes for the mounting screws.
Ceiling fan mounting box screws.
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Replacing a ceiling box is a messy job.
First this has to be a properly installed ceiling fan box you can t put a fan on a lamp box because the dynamic forces of the vibration will tear it out of the ceiling.
This being a bit light for a fan also expect 8 32 or 10 32.
On normal electrical boxes screws are usually 6 32.
Either way the front edge of the box should emerge through the ceiling flush.
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You can also use a rod system adjusting the position of the box on the rods and then screwing the rods to the joists.
Ground screws are 10 32.
Find ceiling fan mounting hardware at lowe s today.