Round chimney, damper help
Hello, I have a fire place that obviously leaks a ton of air into the house. These photos are from last year, I removed the cap to access the inside with the attempt to plug it for the winter. Photo 3 of the inner insert can be pulled out, I made a foam plug and put the insert back in. There is an air gap around the chimney inner pipe that I did not seal, think that air gap around the inner pipe allows cold air into the fire place as it is still leaking with the plug installed. I had a fire place company stopped by last fall and quoted a top mount damper, but I believe he said that would seal the air gap space? Does that make sense? Also if this is DYI-able what would I need, literally open to all suggestions and would like this to be a functional chimney.