Dampers are adjustable plates in the fireplace that are used for controlling the draft. It is found in the throat of a chimney that is located above the firebox. They block the flow of air through the chimney and out of the house when the fireplace is not being used.

The fireplace dampers need to be regularly checked for safety. Usually the dampers have a metal-to-metal form that prevents leakage. With some of the newer fireplace designs, closed dampers can be particularly hazardous because burners can be ignited by the simple flip of a switch. The fireplace starts losing its effectiveness if the damper does not work properly. The cost of a damper is reasonable and a professional can replace or repair yours with little trouble.