There are a number of tuyeres around the upper part of the hearth. Through these tuyeres a blast of hot air is blown in. around the lower part of the hearth there are one or more iron tapholes. above the iron tapholes there are one or more slag holes.

• 在炉缸上部周围分布着若干风口，热风从这些风口鼓人炉内。在炉缸下部有一个或多个出铁口。出铁口之上有出渣口。