The Sauna has no chimney, but vents to the inside of the sauna chamber. When the fire is burning, a hole in the roof or high in the walls is opened to allow the smoke to escape. This fire is fed until there is enough heat stored in the stones to maintain the sauna temperature. Before the sauna can be used for bathing, the fire must be extinguished, the coals removed, and all of the surfaces of the inside of the Sauna need to be cleaned of the ash in the room. The smoke door in the roof is closed, and then the bathers enter. . one advantage that the black banya has is that smoke and soot are natural disinfectants, so the inside of a black Sauna gets a complete disinfection every time it is used. A white Sauna has to be disinfected using other means. At the beginning of the last century and earlier, all were black Sauna. The disinfecting properties of the smoke also made theSauna the cleanest place available. The banya was used for treatment for the sick, a delivery room and even the funeral parlor.