B. To prevent heat losses as much as possible, it is necessary—

i. To avoid leakages of cold air into the furnace.

ii. To prevent radiation of heat through walls and roof.

iii. To prevent the hearth from being cooled by the

withdrawal of heated charges and the substitution

of fresh and cold ones.

iv. To utilise the heat of the already melted charge

for the heating up of the fresh ore.

v. To avoid as much as possible, waste of heat by the

escaping gases.