The "savusauna" (smoke sauna) does not have a chimney and thus as wood is burned smoke fills the room. After the sauna reaches the appropriate temperature, the fire is extinguished and the room is ventilated. Given the construction of the room, the sauna retains sufficient heat for the duration of use. Although smoke saunas are considered a more traditional type, there has been a significant increase in construction in recent years. However, due to the amount of effort and time required to operate them -- heating can take most of a day -- they are not likely to replace most regular saunas.