Fireplace draughts/chimney air infiltration can easily be the single largest contributor of air leakage in homes throughout the world. Next in line would be evaporative coolers and then exhaust fans without draft stoppers. Anyway, this is a quick video, that helps people grasp just how leaky fireplaces can get, and gives people a good start to improve the overall performance of their building envelope for heating and cooling. In this video we blower door test a building with and without the fireplace isolated.


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