Note: Patina may stain lighter colored chimneys

It has a tight

wood stoves

and they are great when they work

Once in a while you run into a round flue liner in a masonry chimney

Chamber Safe Universal Damper Kits Note: Patina may stain lighterChamber Safe is a high performance refractory parging material, designed to strengthen, streamline, and restore the critical smoke chamber area in masonry chimneys. Comes in a 5 gallon (30 lbs.) bucket. Chamber Safe can repair: Firebrick and Masonry in Smoke Chambers Ash Pits, Clay Flues, Fireboxes and Kilns Masonry Heaters and Masonry Ovens Masonry Walls and Vent Connections Woodstoves and More!