I want to replace a small hanging chandelier with a ceiling fan and am trying to figure out if the existing box can support a fan. I don't see labeling on the box itself but noticed this large rod sticking out in the center of it. Any idea what that is? Is that perhaps an indicator that it's attached to a horizontal beam that mounts into the joists?
Update: So I managed to get my scope camera up there and took a picture (see below). It looks like there is a beam that goes across and connects to the joists with 1 screw on each side and 2 staples. Do you think that is strong enough?