Looking for Clay chimney resources / installation tips

[Phil1441]

I am building the Forno Bravo Premio 2G 100 wood fired oven kit. I would like to install a clay chimney, Does anyone have resources or installation tips. Having trouble finding the right size. Thank you

[UtahBeehiver]

A clay flue cannot be installed without insulating it. There is a video posted by David S showing how the thermal differential between the inside of a clay flue and the outside ambient temperature causes the flue to "severely" crack. However if insulated the cladded with a decorative outside, a clay flue is feasible. Most building supply or fireplace distributors carry clay flues. Note, a rectangular flue is not as efficient as a round flue so an 8" round ID flue may require a min 9" rectangular flue.

[david s]

It’s only down the bottom where the heat is more intense, that cracking is a problem. Clay chimney pots at the top of chimneys perform excellently all over the world. However a clay chimney lower down(probably the bottom 500mm of the chimney’s height) must be insulated around its outer surface to prevent cracking failure.