Had someone ask me about a new install in an old fireplace. The fireplace is 5 feet wide, 4 feet tall and 3 feet deep. They did not want to hide any portion of the fireplace as part of the project, just get wood heat going. I thought an insert would be best, just less the metal flanges used to close off the opening. Other opinions? Will service a large room with 20 ft ceiling and also hope to provide heat to second floor via doorway from overlook platform in same large room.