Wade Design & Construction Inc The fireplace style is a Rumford, check out Superior Clay Products at http://www.superiorclay.com/. These fireplaces are incredible, and very efficient. I have built several, including one for my own house. They are great to use for outside spaces too.
Bentley Design To my eye it doesn't appear to be a sliding door, looks more like a modern style French door. If you can't find the manufacturer or would like a particular size give Bentley design a call , they'll build it for you. You can reach them at 727-631-2882
coloradolover1 Not a French Door . . . it's an accordian-style door that folds back. (Refer to the photo of the outdoor patio . . . you'll see this room with the door completely opened.) The entire wall folds back and, in effect, turns this into a covered outdoor room that opens onto the patio. I don't know if this is a Nana Wall but that company does produce an accordian wall, and it is a superior product. We have one in our vacation home and it is beautiful.
Inside, the concrete fireplace is a heavy anchor to the room. The aesthetic may not be for everyone, but the woodgrain trace on the concrete links it to the wood exterior; in this way it seems appropriate.
Yet another example of low profile cathedral ceiling. In this example, I especially like that the wood is pale, untreated and the lack of additional wood trim makes the room quite modern while keeping the agrarian style.