The plastic box itself is strong. It comes with a gasket that you need to cut and insert into the duct around the edges (so be careful! If you cut it too short, a second try won't do!). The screws go through the box to the corners (obviously) outside the perimeter of the gasket. The bolts are much longer than necessary and have very thin threads, requiring MANY turns to tighten. In addition, self-tapping screws are not rust-resistant and quickly begin to corrode. The attached photo shows them after a few weeks.
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