I don't have that measurement for you, as I have the 2109S, but here is something to keep in mind, if you did not know it -- If you have a rug in front of the sofa, when the slide out is out, when you slide it in, the sofa will be pushing the rug out of the way. So if you want to fill that area with a rug, you will need to fold it over out of the way when you bring the slide in.
We just use a 5' or 6' rug runner for the interior, so it can be moved over toward the kitchen in our 2109S when we move the slide in.
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