Abstract: Disclosed is a forced-air heat extractor for use in a conventional fireplace. The heat extractor includes a plenum through which air is circulated by means of a blower which is positioned in an inlet duct connected to the plenum and located in the fireplace. The plenum is provided with a temperature responsive relief closure in its top wall which opens to permit the free flow of heated air upward toward the fireplace's flue in the event the temperature in the plenum exceeds a predetermined value, as might occur in the event of an interruption in the flow of forced air through the plenum, thus protecting the blower motor and associated circuitry from excessive temperatures. A bottom bar having an air inlet to which is coupled the inlet duct is positioned on the forward, lower portion of the fireplace. Upon this bottom bar a firescreen may be conveniently positioned. An outlet duct similarly couples heated air in the plenum to an air outlet in the bottom bar.