aunsafe2015
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a
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There is only 1 type of plastic box that is suitable for hanging a fan & the fan mounting bracket is fastened to the framing with it. The OP's is not a fan rated box.I would not mount a fan on any kind of plastic box. Metal box or the fan isn't being hung. I just replaced a plastic box that was fan because of the the fan mounting brackets on the box broke.
I've seen a few styles that use plastic boxes, but the fan is NEVER supported with screws hanging directly from the plastic. Usually there's a metal strap hidden on top of the box that connects the machine screws the fan hangs from to either the framing or the expanding arm.There is only 1 type of plastic box that is suitable for hanging a fan & the fan mounting bracket is fastened to the framing with it. The OP's is not a fan rated box.
yeah it isnt. get a proper fan rated boxI'm leaning towards thinking that it is not fan rated. I'm going to remove the box and inspect further tomorrow, and likely replace it with something like this: https://www.amazon.com/dp/B000HEIYHA/?tag=atomicindus08-20
The fan will be supported by the screws in the framing, I still prefer metal.