Chimney Savers 12117 Lyemance Energy-Saving Fireplace Damper - 17x17 Inches for Wood Burning Stoves & Fireplace Inserts - Reduce Heat Loss & Save Energy

The Lyemance energy saving damper is designed to stop air loss through chimney and can save you on your energy bill. Itis atop mount chimney damper the is installed on top of your chimney flue and has a line that attaches to the side of the firebox to open and close it. Fits Inside Flue Sizes 15" x 15" to 17 1/2" x 17 1/2" and has a Cross-Sectional Area of 172 sq. inches. Shipping weight:12.07 lbs. Shipping dimensions: 16 x 19 x 19