Our wood burning, masonary box fireplace has its original "throat" damper and a newer Lyemance top seal damper.
Neither one seals out the cold air! As imagined, the top seal damper is better than the throat damper, but expected the top seal damper to solve the cold air problem.
What else should be considered?
Had the masonary remortared one year ago(as our home inspector suggested, prior to purchasing)--didn't seem to help or perhapse the person didn't do the best job.
The house is 20 years old and was built with a wood burning fire place. Previous owners had(at some point) changed it over to gas logs. We reverted it back to its wood burning ability.