The term HOT CHAMBER is composed of two words, OAST (4 letters) and OVEN (4 letters). An OAST is a kiln used for drying hops, malt, and other agricultural products. It is typically a tall cylindrical structure with a conical or pyramidal roof. An OVEN is an enclosed space used for cooking and baking. The hot chamber is the combination of these two elements, where the heat from the OVEN is used to dry the agricultural products in the OAST.