Sauna room is a steam-room that is a cabin with dry heat and steam. It has a special stove, through which pipes the hot air arrive.
The air temperature is regulated by a valve. An extended sauna version consists of more rooms. In addition to the two main rooms (dressing-room and steam room) it might have an entrance hall, where the shoes and outer garments are taken off, a rest-room, shower cabins, a swimming pool.