Bob and Peggy,
You should not be able to see the heavy "L" bracket. It should be hidden behind a valance the runs across the top of the bedroom slide. Once behind the valance, the valance pull or pushes the fan along its own slide as the bedroom slide goes in and out. See the attched pictures.
One shows the valance removed and you can see the "L" bracket. The other with the valance properly installed with the "L" backet behind it and hidden.
Russ
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