Abstract: A novel damper is provided which is attached to the top of a chimney flue for minimizing or altogether eliminating heat losses and air conditioning losses through the chimney flue when the chimney is not in use as well as preventing objects and/or animals from entering into the chimney. The damper comprises a substantially rectangular stamped frame having a central opening and a portion adapted to flatly abut against the top of a chimney flue. The frame further includes at least two and preferably four flanges extending downwardly from the central opening while screws threadably engage the flanges to secure the frame to the top of the chimney flue. A door is pivotally mounted to the frame and movable between an open and a closed position while a spring resiliently urges the door towards its open position. An elongated chain is connected at one end to the door, extends through the chimney flue and is accessible at its other end through a fireplace opening.