Lock-Top Sealing Dampers 8 in. x 13 in. The open and shut solution to replace worn out fireplace throat dampers. Installs at 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. Lock-Top 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.

　　- Lock-top mounts on top of your chimney to keep out animals, leafs, bugs, snow and rain

　　- Lock-top easily operates from inside your firebox and seals tight every time you close it, eliminating any draft

　　- Lock-top damper is made of cast-aluminum and stainless steel

　　- 32 ft. Stainless steel cable and all mounting hardware are included

　　- Will fit flue sizes from 7 in. x 11 in. to 9 in. x 14 in.

　　- Limited lifetime warranty