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re: wood stove "puffs"
27 dec 1999
troy wrote:
>...i find that one of the most common problems causing backdraft, is when
>you have the house bottled up and you have been burning wood for a while,
>the air pressure inside the house drops from the air going up the chimney,
>and is much lower than the outside pressure... for me i open the front door
>for a minute or two to equalize the pressure...
i wonder how long a "while" is, before the house pressure stabilizes,
and how long a minute or two of door-opening makes a difference after
the door is closed. i suspect it's a very short time in both cases.
say a woodstove draws 20 cfm, and 10 house air volumes per hour rush in with
a 50 pa depressurization (about 0.5 ach under natural conditions), and the
house contains 32x32x16 ft^3 of air, and the rate of airflow into the holes
and cracks is proportional to the square root of the pressure difference...
nick
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