There are particular requirements for storing medical gas cylinders as well as requirements for bulk tank storage in healthcare settings; these regulatory requirements exist specifically for cylinders that are not in use. In use refers to cylinders being used by a patient, or attached to equipment and ready for immediate use, or located in patient rooms about to be used. Requirements vary depending on the total amount of cubic feet of gas needing to be stored, with the most stringent regulations for more than 3,000 cubic feet of gas, less stringent requirements for 300-3,000 cubic feet of gas, and the least stringent requirements for less than 300 cubic feet of gas. These requirements are in place to reduce the risk of accident and injury.