Ed Sirett coughed up some electrons that declared:


Although the wood burning stove does not come under BS5440 you would do
well to treat it as if it did, unless there are regs or instructions that
state things more accurately.

In BS5440-1 (open) flues must still work even when extraction devices in
the room and adjacent rooms are set to their maximum settings. You may
find that you then need a bigger vent to get things working OK.
You would discover this when the warmed flue fails a smoke test but passes
when you open the window.


Thanks again Ed.