I am installing some LED lighting on my family room wall. While fishing the cable down the wall, I noticed that there is a horizontal 2x4 blocking the stud bay. I was under the impression that this is a fire block, but I'm not sure. I always thought that fire blocks were comprised of one 2x4 run horizontally. On the left side, there is a 2x4 that is running vertically. It appears to surround metal ducting. Is this something that is providing structural support to ductwork? Would it be okay to drill a 3/4" hole through the horizontal 2x4?
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