Well, I was working on laying a 4in isolated flexible airpipe to go from the first floor, through an airshaft aside the chimney down to the first floor to heat the ground floor with the stove on the first.floor (our living and bed room). Bought a thermal camera to see results (and winter optimization) but nothing happened. Turned out the pipe had ruptured inside the air duct. Now have to redo the work… At least I do not have to finish it tomorrow