I currenty have a 25 year old Majestic MHC series manufactured fireplace and it's time for something efficient. The Majestic is installed across a corner in the living room and has a floor to ceiling faux stone faced wall around it. I would like to get an insert style woodburner, the Napoleon 1402 or Buck 91. What I'm confused/concerned about is since I don't have a masonary fireplace how could I install one? I don't know what is surrounding the Majestic for insulation. Any help or suggestions would be appreciated.