Originally Posted by
Aaron Miller
Is this a common practice? If so, on masonry or metal chimneys or both? Are there any studies or research to show its actual effectiveness?
Just Curious,
Aaron
Not necessarily common, but it's done and it does help in certain cases.
Granted, this is typically a pressure issue. From what we've seen, it does tend to lessen the effect, though.
You wouldn't install a top mount damper on a factory-built fireplace. If the damper is inoperative or defective, you need to replace the fireplace unless the manufacturer has specific repair parts available.
Bart