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Chimney Height and Size
Flue sizing depends on such local conditions as prevailing
wind, height of chimney, proximity of taller, nearby
structures, etc. A good rule of thumb is to choose a flue that
has an area of about 3-4 times the door height. Depending
on what is nearby, you may need a taller chimney. One
option is to test your oven after it has cured with a single
section of chimney pipe to see how well it draws. If it is not
enough, you can add another section to extend it
Spark Arrestor/Chimney Caps
Use a spark arrestor chimney cap. It uses heavy gauge
steel and is similar in style to a window screen. Its purpose
is to trap burning embers that may float up the chimney and
stop them there. Once the fuel of the ember has been used,
its temperature will decrease and the by-product will be a
small amount of ash. A chimney cap will also keep rain from
pouring down the flue. There are many styles, ranging from
a plain metal arrangement, to whimsical ceramic gargoyles.
The Simpson DuraTech chimney system contains a UL-
approved chimney cap.
Pompeii Oven Instructions
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