A custom surround can look really sharp.
If this is an exterior wall fireplace then definitely plan on a block-off plate sealing the damper area and if there is room, mineral or ceramic insulation on the back wall of the fireplace (but none on top of the insert). I would do this regardless of a surround or not. It will definitely improve the heat output into the room.
If this is an exterior wall fireplace then definitely plan on a block-off plate sealing the damper area and if there is room, mineral or ceramic insulation on the back wall of the fireplace (but none on top of the insert). I would do this regardless of a surround or not. It will definitely improve the heat output into the room.
