See-By or Double-Sided Fireplace: This newer product of wood-burning fireplace has a glass enclosure on each side of a fireplace to ensure it could warmth two rooms concurrently.  As well as the dangers of looking to repair a chimney yourself, the chance of accidentally resulting in more complications is large. https://chimney-sweep53222.theideasblog.com/28531317/5-simple-statements-about-fireplace-inserts-explained