Under the new regulations, smoking rooms are allowed, but are subjected to very strict conditions: they may occupy at most 20% of the total floor space of the establishment and their size may not be more than 35 m²; they need to be equipped with separate ventilation which replaces the full volume of air ten times per hour; the air pressure of the smoking room must constantly be lower than the pressure in the contiguous rooms; they have doors that close automatically; no service can be provided in the smoking rooms; cleaning and maintenance personnel may enter the room only one hour after it was last used for smoking.