I have an existing electrical box that appears to support ceiling fan installation but it is missing the 2 female screw holes I'm used to finding in these boxes.
Is there some sort of intermediate piece that attaches to the two existing post screws? I cannot find any brand or model information in the interior.
Best Answer
This looks like a Legrand 22200 retrofit box. They typically have a riveted screw on each side, but I don't see either.
You might not need to buy a whole new brace, however. Take it down and go to the hardware store. They should have a box that will work with it as-is.