I have a heat shield on my mantel that was attached by the folks who installed my wood-burning insert. The shield, which is about an inch from the mantel, gets very hot (too hot to touch). The mantel itself is only warm, but my concern is whether the center screw attaching the shield to the mantel could start a fire. The screw head gets very hot, but I have no way of telling whether the threads that are actually in the wood are similarly heated. There is a porcelain cylinder around the screw that acts as a brace/spacer between the mantel and the shield, and that too is very hot. Should I be concerned? The mantel is an old barn beam that is quite dry. I have no visible evidence that it has burned and it never smells smells smokey. I'll probably replace it altogether with a stone or plaster mantel soon for peace of mind. In the meantime, I'm not sleeping well... Thanks N.B. I can reduce the shield heat by turning up the fan, but I generally like the fan low because of the noise.