And guess what - I don't care, and neither do you. Solid and well designed, it does what you want - it hides the exposed cable entry point. The only reason I'm giving 4 stars instead of 5 is that the case has outlines for screw holes, but no holes (no point drilling yourself); and the case has a channel on the back that *seems* to be used for caulking or caulking. For my application where the case plugs into the board to flush mount, a pad on the back would be ideal. I have no idea what this duct is for other than a rubber gasket.