The object is fire hazardous
Sauna is local, in which a lot of fires are performed. Most often they occur due to wood, which the walls of the sauna are sheathed, because at strong temperatures it can release gas that can self-load. The reason can also be in the apartment, and then the fire is dangerous for the whole house. When installing the sauna, it is important to familiarize yourself in your area and follow all the fire rules. We must not forget about fire valves on air ducts. This will save other living quarters from smoke.