Awhile ago someone asked about a place with multiple fireplaces and uncurable backdrafting at some of them.
A class I went to today mentioned that all chimneys should terminate above the house envelope, otherwise the stack effect in the house will cause back drafting through the chimneys which terminate below the envelope. I would prject from that that multiple chimenys may interfer with each other, as well.
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house envelope
the stack effect in the house
would you explain what these are, please?