A cylinder manifold is a group of large gas cylinders, commonly used to supply gases via a pipeline to a building such as a hospital. Cylinders are often arranged into two groups; a primary and secondary group. In a hospital, size J cylinders are commonly used, which are capable of holding 6800 litres of oxygen each or 13,600 of nitrous oxide. Gas manifolds should be stored in an area separate from the main building. It should not be exposed to the environment and should be well ventilated. * v * t * e * v * t * e