Right
min.50cm
min.30cm
Not right
Tightening cross section
of the chimney because
the smoke tube is pushed
into the chimney too much
Faulty draught
because a
fire-place's
door (not in
use) is open
False air because of an
open tube joint
False air
because of a
leaky tube joint
32
Obstruction because
the smoke tubes are
led as facing each
other
False air because
of open
fire-place door