The term 'Kind of Furnace' can refer to two different types of furnaces: a BLAST furnace and an Open Hearth furnace. A BLAST furnace is a type of furnace used for smelting in which air is blown into the bottom of the furnace to create a high temperature. An Open Hearth furnace is a type of furnace that uses a hearth, or floor, to contain the fuel and heat the material being processed. Both types of furnaces are used in industrial processes such as metalworking and glassmaking.