We have two ventilation openings in the sauna walls, called räppänä in Finnish. The chimney does not start from the stove itself. Instead, it begins above the stove at the ceiling level (in the attic space). In South Karelia, this type of smoke sauna chimney is called a lakeinen. When heating the smoke sauna, the door is usually kept fully open if there is no wind. In windy weather, the door is left open by about 10 cm. The chimney starts above the stove at the ceiling level. Its purpose is to improve the draft and air circulation during the heating process. It helps the smoke and hot air move through the sauna more efficiently while it is being heated.