This is a question that the members of our team are occasionally asked. A chimney damper is found above the firebox and has usually been constructed using metal. It is a flap-like device and you operate it by using either a lever or chain.
When open, it releases smoke; when the fireplace isn’t being used, it is often put into the closed position simply to retain heat. Over the years, with regular use, it can be subject to corrosion, become stuck in one position, or receive some level of damage.
This is one of the key areas our Chimney Sweeps of America experts will inspect and investigate if you are having problems with your fireplace.