Current built-in dampers leak. Leaks mean heated or cooled energy is being lost up the chimney, opening and closing these dampers is not easy. Is it open? or closed? Yes.... stick you head into that dirty small opening while soiling your shirt trying to find out which position it is in. BUT.... Home Doctor of America has a better way. It saves energy! It saves confusion! It's easier to use! We provide the testing to show it works, all materials and labor are included. Ask our energy auditor if your chimneys broken damper needs to be addressed today.