A damper is a lever or pulley activated door within your chimney and must remain open while the fireplace is in use.  There are conventional throat dampers that sit right above the firebox or a top sealing damper. Top sealing dampers mount on top of the chimney and seals with a rubber gasket. There is a cable that runs down the flue attaching in the firebox for access. Top sealing dampers are favored because they can save you money on heating and air conditioning costs and help prevent debris from entering.

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