I ran into an installation where a couople had an Accentra FS in their living room and then added an XXV to the formal living room. Two stoves about 205 feet away from one another on the first floor. There are many energy improvements made here on the house and their installer refused to install the stove with an OAK. I can see the frustration as the install was in the center of the house in a chimney; where are you going to get air from? Simple. The chimney. Installation was a 4" liner up through a termination plate, sealed and insulated. I then ran the air hose into and pass the plate into the smoke chamber with an elbow and screen for safe measure and then mounted this contraption on the cap. Nifty hugh?