It's a steel

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Search through Google to get suggestions for building wood stove chimneys.

http://edis.ifas.ufl.edu/FR018

Usually the inner liner is stainless steel or terra-cotta spaced away from the outer support masonry with no insulation. There is usually a complete pre-manufactured two or three-sleeve stainless chimney with supports or a masonry chimney built in the right manner.

www.heatpro.us energy businessmen's knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.