Dampers - Keep in the heat or A/C in your house!
A damper mounts to the chimney top and seals with a flat rubber gasket when closed. The control mounts in the firebox and can be either a pulley or a lever for quick and easy access. Dampers seal out rain, snow and the elements while sealing in the heat or air conditioning you have on inside your house.
There are many kinds of dampers to fit any type of need you have!