Subtract 50cm from external diameter.
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Where in the Bible do they said do not take your nose for chimney
It is best to start at the bottom and work up.
"Chimney" is properly pronounced 'chim-nee (two syllables). It is often mispronounced 'chim-a-nee, like the song "Chim Chim Cheree" from the musical Mary Poppins.Chim chimineyChim chimineyChim chim cheree...It is also occassionally mispronounced 'chim-blee, a fairly common pronounciation on the farm back in the 50's.
I think it was the ancient romansthis is based purely on past knowledge (i know they invented quite a few weird but useful things like that), and something I'm sure i read on the net.
I don't think this is considered a "mathematical" question. It's more a question of building codes. I say check with your local fire department.