mel jacobson on wed 12 sep 07
in my experience, brick is the best chimney for
a wood kiln. well mortared. tight.
the specs for size/height is not some
pre/determined from a book sort of thing.
it all depends...size of kiln, air flow, heat flow
and wind conditions. we added three more feet
of brick to our wood kiln stack. helped a great deal.
now we feel it is perfect. fires like a dream..no
stalling. (donovan palmquist made that call, not me.)
wood fired kilns need more air and more stack than
any other kiln. you almost have to fire it and find out
what is going on. then make adjustments.
adding any sort of steel or metal stack will
be fine in the short run...but it will never last.
remember, flame will run up that stack...and
the entire metal will glow bright red at night.
it if is a metal/bestos type...it will still glow, but
you will not see it at first. at least until it burns through.
stainless will give you a few more firings...but it to burns up.
those metal stacks are for wood stoves. not kilns.
if you were to buy a metal stack that would work on a wood
kiln...it would be thousands of dollars.
brick works. inexpensive, it lasts for years....and will serve you well.
if you have to add more height...just add brick.
or take off some if you need it lower.
simple.
i have seen several of those metal/bestos stacks used on
a gas kiln. they will fail, at some point. as most know...i only
use the kaowool flue liners...soaked in itc. they go into a spiral
pipe metal stack. almost fool proof.
mel
from: mel/minnetonka.mn.usa
website: http://www.visi.com/~melpots/
Clayart page link: http://www.visi.com/~melpots/clayart.html
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