Standards for Establishing Places for Manufacturing, Storing, Processing Public Hazardous Substances and Flammable Pressurized Gases, and Regulations on Safety Control of such Places Article 22

While the location, construction and equipment of the indoor storage for Class 2 public hazardous materials other than combustible solids, or Class 4 public hazardous materials with a flash point not below 70℃ shall meet those requirements set forth in Articles 21.1~21.3, and 21.7 ~ 21.14, the warehouse of the indoor storage may be provided in a building having two or more storeys and the building shall meet the following requirements:1.The floor of the lowest story shall be at where higher than the ground and the height of each story shall not be greater than 6m;2.The total floorage shall not be greater than 1,000 m2;3.Walls, beams, pillars and floors shall be of fireproof construction, stairs shall be constructed with non-flammable materials, and no opening other than the access shall be provided to the exterior wall with the risk of fire extension; and4.No opening shall be provided to the floor on the second storey and above unless the partitioning wall in the stairway is of fireproof construction and is separated with fire doors of 30 minutes and more fire rate.