•Made of stainless steel & cast aluminum for an unmatched durability •Designed to help reduce heating & cooling bills; prevent downdrafts & odors; keep out rain, snow, birds, & pests; help reduce outside noise •A simple & ingenious system allows opening & closing the shutter with the help of a vertically acting spring damper which operates easily from inside your fireplace •When closed, the Top Damper serves as a chimney cap & with a slight pull of the chain, it releases the spring open when you are ready to enjoy a nice fire •All parts required for the installation & 30 feet of stainless steel cable are included •Suitable for any masonry chimney with an inside flue from 9" x 9" to 12 1/2" x 12 1/2" •Does not require the addition of a safety device; often required & constraining