Chimney Flue Clay Liners

Looking for structural cracks and overall chimney clay liner integrity.
www.mychimneyprofessional.com

[@We_are_the_light]

I learned absolutely nothing

[@artlover5798]

What are the white particle's in the ceramic? I want to turn two inserts into charcoal cooking stoves, I have an idea for a great product!, is it ceramic.

[@hispanicprepper1218]

How many inches should a clay chimney flue be past the cap?

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Thermocrete