Dear Lanny
Correct. We are using a flap-type which is installed in the side of the chimney by putting a Tee between the first and second pipes (they are clay pipe chimneys). At the moment we have no idea what the ideal draft is for the stoves – 2 and 3-pot Jolentho Stoves. We will make measurements and test the performance at different sustained draft levels. There is a significant difference in the field when a 3 or 5 meter chimney is added to the same stove. Mostly there seems to be too much air drawn into the ones with tall chimneys. Regards Crispin ++++ Like a barometric damper?
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