I would like some opinions about adding a 1 inch blanket of kaowool (ceramic fiber) over the top of my insert when it is installed. It seems to me that it might make more heat available to the blower duct and put more heat out into the room instead of into the masonry. My only concern is that it might somehow cause the insert to over-heat. I have access to this material at my work and was told to take it if I want since I only need about a 24"x15" piece to cover the top.