I tried the tempered glass inserts, I got from you, for my wood stove last night. What a difference it made in the amount of heat that was given off by the stove. I guess at least 25% more heat is radiated out compared to the old metals inserts that were in there before. This will save me a lot of wood over the winter. Plus, I now can see how to regulate the damper for efficiency, and enjoy the view of the burning fire. Should of done this along time ago.