My F600 install is almost complete. Stove is hooked up to 2/3 of the chimney, and if this rain would quit for an evening I'd be done. Installed my rear heat shield tonight and finally figured out what the folded up piece of metal that came with the stove was for . Apparently Jotul or my hearth store stuck a bottom heat shield in the firebox prior to shipping. The manual says that the bottom heat shield is required for all alcove installs. I do not have an alcove install, and I have a 1.5R hearth pad of proper size under the stove, so is there any reason to use the heat shield other than the fact that it was free?