• The Lyemance Damper is made of durable cast aluminum. 
• Lyemance 17 x 17 Top Sealing Damper
• The Lyemance Chimney damper will bring efficiency into your home and help conserve wasted time, money, and energy. Eliminates as much as 90% of air loss of a traditional damper. Designed to lock in heat, while keeping rain, snow, and debris from entering the chimney. The Lyemance Damper can be installed in minutes.
• New in Box, old stock
• Minimum outer dimensions of flue tile 15" x 15", Maximum outer dimensions of flue tile 17-3/4" x 17-3/4"