Install customer supplied ceiling fan Replace plastic box with fan rated box The reason for today’s visit was to look at installing a customer supply ceiling fan and a pre-wired location in the front bedroom on the second floor. The bedroom currently had a surface mounted ceiling light however, when we pull down the light, we noticed that it was a basic plastic old Work box. I informed customer I would have to replace the box to support the weight of the ceiling fan. Customer agreed we went ahead and installed the new fan with the new bar box fan support brace.