Abstract: The wall extending laterally away from the side of a fireplace opening is provided with a vertical recess that receives one end of a track extending across the front of the fireplace below the upper surface of its hearth and supporting a glass door normally located in front of the fireplace but extending part way into the recess, into which it is movable to a retracted position. Mounted between the front surface of the recess and the door is a vertical sealing strip that engages both. A horizontal sealing strip mounted between the door and the front surface of a downwardly opening slot that receives the top of the door engages the door. To help hold the door against the sealing strip there is a rigid horizontal rod mounted in the slot and recess behind the door and engaging the door near its top. A fire screen may be mounted on a track behind the door track.