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double venturi flue box for woodfire ???

updated tue 8 jan 08


Robert on sun 6 jan 08

Hi Clayfolk,
I am building a 30 cu ft kiln from homemade castable. I have used/built
the double venturi flue box very successfully with propane kilns. My
last one was 85 cu ft and fired very efficiently with an outlet port of
only 32.5 sq in of cross sectional area. I am building this one as a
multi fuel kiln and the wood firing component will be a double bourrey
system parallel to the axis of the arch. I would like to use the double
venturi flue box ala nils lou/mft but expect to need a larger outlet
flue for wood than lp. I would like to cast the outlet flue to the
size need for wood firing and cast a separate insert for the gas
So the question is... Has anyone on the list used the double venturi
flue box on a wood kiln? with a bourrey box? If so any
observations related to flue sizing would be greatly appreciated.