One of the blowers (BIS Tradition CE Fireplace) was making noise, so after the fire was out I took the front facade off to check it. A 8"X10" piece of some insulation has fallen onto the blower from the bottom of a blanket that covers the back wall, it seems to be just hanging there and the blower was moving it around. How important is that insulation? How would I replace it? I don't see it listed as a part, what would I replace it with?