MAINTAINING AN HISTORIC BUILDING
THERE IS AN OPEN FIRE IN THE MAIN BAR OF THE 16TH CENTURY PUB THAT OWN AND RUN. THIS IS AN INGLENOOK TYPE AND THERE IS A METAL CANOPY OVER THE HEARTH AND IS PART OF THE CHARACTER OF THIS OLD BUILDING. AT TIMES IT SMOKES A LOT AS THE CHIMNEY DOES NOT DRAW, PARTICULARLY WHEN THE WIND IS IN A CERTAIN DIRECTION, WHICH IS PART OF THE CHARACTER I DO NOT LIKE. IT IS NOTICEABLE THAT WHEN THE EXTERNAL BAR DOOR IS OPEN IT SMOKES LESS, BUT WHEN IT IS CLOSED AND ALSO WHEN THE DOOR FROM THE KITCHEN OPENS IT STARTS TO SMOKE AGAIN. THE CHIMNEY IS ON AN EXTERNAL GABLE WALL.
This is an example of basic physics, where the higher one goes then the lower the air pressure will be. A chimneystack functions by applying this principle as there will be higher air pressure at the hearth (base) than is found at the top, and it is this pressure difference draws ..
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