My father in law gave me a insert he bought out of somewhere in North Carolina many, many moons ago. The stove works great.......keeps our house very toasty. We have used it for about five years now. He recently brought over a box of spare parts because he moved into a new place. This stove has a door with a glass panel in it approx. 15" x 24" of clear ceramic glass. Now here's the kicker.......the spare parts box contained two additional glass panels but instead of one piece of glass, they are three seperate panes that make up the 15x24 size. One is in it's orignal package......one has been used before. For the life of me, I can't figure out why three pieces would be used over one solid piece size. The only thing that I can think of is that it was for some sort of expansion..........but it must have been one heck of an air leak. This stove has vents above the glass on the door for an airwash setup I guess.......Has anyone seen anything like this?.........the three pieces of glass to make the glass panel has me stumped.