Start by confirming whether you have a masonry or a prefabricated (factory-built) fireplace — this determines door compatibility and safety.
Masonry Fireplace
- Built from brick/stone; real brick firebox.
- Typically full brick chimney.
- Works with heavy-duty custom doors; ceramic glass optional.
Prefab (Zero-Clearance)
- Factory-built metal firebox; metal chimney pipe.
- Manufacturer label/tag in louver or inside frame.
- Use model-compatible doors; tempered glass typically required.
Tip: If you see a metal ID tag or a metal chimney pipe, you have a prefab (factory-built) fireplace. If the firebox is made of brick and the chimney is full masonry, you have a masonry fireplace.