The trim around a fireplace is called a surround or mantel surround — terms used interchangeably to describe the decorative frame that borders the fireplace opening on the left, right, and top.
A fireplace surround has two main components: the mantel shelf (the horizontal ledge across the top) and the legs or pilasters (the vertical side pieces). On electric fireplace inserts, a separate piece called a trim kit covers the gap between the insert face and the rough wall opening. Masarflame trim kits, for example, expand coverage up to 5.8 inches per side to convert a rough installation into a finished look without custom carpentry.
- Primary term: fireplace surround refers to the full decorative frame around the opening — top and sides.
- Mantel or mantelpiece specifically refers to the horizontal shelf portion above the firebox opening.
- Trim kit is the installation-specific term for the metal frame covering gaps between an electric insert and the wall opening.
- Masarflame trim kits cover up to 5.8 inches of gap per side on compatible insert models.
- Hearth refers to the floor surface in front of the fireplace, a distinct component from the surround.