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For the construction experts...what are these things? And why is the bottom one slightly different from the other two?
It looks like a shaft wall. It's just metal studs and drywall, but it's usually used in places where you can only physically get to one side of the wall, such as an....elevator SHAFT.
My guess on the horizontal pieces is just something to screw to mount equipment on the inside. Or they just ran out of long pieces of sheetrock and wanted to use the scraps...
[This message has been edited by bgrimm05 (edited 7/18/2014 12:03p).]