h) The cowls must not hinder the draught.
Fig.-12
ii)
Clean the chimney at least once a year.
Fig.-13
j) The joints of the tubes forming the chimney, in the event of using simple metal
tubes, must be sealed using refractory filler. Each tube must fit into the next to prevent any
creosote from reaching the outside.
k) The exterior metal chimneys must be built with special double heat-resistant tubes
for solid fuel.
