If the box is between truss on a metal rod and it is plastic, there will be a metal bracket on top side of bar, and there will be studs that extend from here through box and stick out face of box to put a nut on to mount fan bracket. If this box is connected to rod by screws in the back of box, I don't believe it is a fan rated box. Maybe have a look at the box, it should say fan rated in back. Good luck.....
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Last edited by triple D; 03-18-2008 at 03:18 PM.