29
Correct
Incorrect
min.50cm
m
in
.5
m
be
lo
w
5m
Lo
w
er
a
s
th
e
to
p
of
th
e
ro
of
min.30cm
Tightening cross section
of the chimney because
the smoke tube is
pushed into the chimney
too much
Obstruction ,
because the
smoke tubes are
led as facing each
other
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
False air, be-
cause a open
fire-place door
