Abstract: A front for a fireplace comprises a concealed fireplace door that slides into and out of a concealed door pocket formed at the side of the fireplace. The door completely seals the fireplace front when in its closed position and a fire is burning in the fireplace. An airvent is provided in a pocket behind the concealed door pocket for admitting fresh air to the fireplace from a source outside of the enclosure when the door is closed. The door is removably suspended from a carriage assembly that rides over the fireplace opening on a two-section track, which can be disassembled for installing and removing the track from the fireplace. The door can be mounted on the carriage assembly by means of studs on the door which removably engage slots in a frame carried by the carriage assembly. Alternatively, the door can be mounted by means of key-shaped slots in the door which engage flared projections extending downwardly from the carriage assembly.