*17" x 17" Fits flue sizes from 14" x 14" to 18" x 18"
*Lock-Top II Chimney Damper inlcudes everything needed for easy installation
*Comes fully assembled and attaches to top of flue with silicone sealant
*Cable drops down the flue and mounts in the firebox and opens with simple control handle.
*30 foot cable is simple to cut to correct length.
*Free, fast shipping and Guaranteed price