Chimney Balloon instaled above a cast iron vestal fireplace damper

Chimney Balloon instaled above a cast iron vestal fireplace damper

This masonry wood burning fireplace had a very loose fitting cast iron damper that let in significant amount of air when the house was brought down to -50 Pascal. A 36x15 Chimney Balloon was installed and the blower door reading improved by 73 cfm.

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