Forgive me if this a dumb question, but I recently got rid of my old smoke dragon where I was able to preheat the flue by placing something hot (rolled newspaper, hair dryer, etc.) directly around/into the flue. My new wood stove has baffle board with fire blanket on top of the burn tubes that cover the flue. To preheat the flue, am I supposed to (1) remove these baffles, (2) place the hot object under the baffle board where the flue is, (3) place the hot object at the front of the stove near the door where I can feel the draft, or (4) something else?