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Lymance-Top Sealing Damper 8 in. x 13 in. The open and shut solution to replace worn out fireplace throat dampers. Installs on the top of your chimney’s flue, quick and easy. Seals the flue shut when the fireplace is not in use. Save money by preventing heat and air conditioning loss. Lymance-top sealing dampers are as much as 90% more efficient than throat dampers because they provide a silicone rubber gasket seal rather than metal to metal seal.