What is the maximum amount of compressed medical gas cylinders in a smoke compartment?

Up to 300 cubic feet per smoke compartment is permitted to be stored outside of a designated room provided the cylinders are properly secured. For quantities over 300 cubic feet but less than 3,000 cubic feet per smoke compartment, cylinders must be stored outside the facility or within an interior room with limited combustible construction with a door that can be secured against unauthorized entry.