With the aid of a stone cage, the heat of the flue can be utilized better. A larger stone capacity ensures a superior löyly (a Finnish word that refers to the steam that is generated when water is poured over heated rocks in a sauna), with longer-lasting and gentler steam due to water taking more time to flow between sauna heater stones. This is also a way of decreasing protective distances into flammable material. Stone cages can also be installed on top of each other, which give your sauna a stylish look.