Hello, all! We recently moved into a 100 year old house that has a shallow existing gas fireplace with an unusable vented gas insert. The space is about 11.5" deep. After inspections by both chimney experts and a plumber, the options are a) rebuild the fireplace or b) find an insert shallow enough not to stick out (and break code). They recommended and 18" wide insert, ventless would be best. Does anyone have any suggestions on where we can find such a shallow insert? Or have any other words of wisdom? We have had no luck finding anything thinner than around 14". Thanks!!