Ask the Experts Q & A
Q: Should the door to the room that holds liquid nitrogen & carbon dioxide cylinders be labeled in a certain way with specific indications on what's stored there, such as "Caution, Medical Gas"?
A: You don't need to specify that gas is present in the room (in fact, I advise against that since patients may want to go in and see what laughing gas is really about!), but be sure that access is restricted. A sign that says: "Danger, Authorized Personnel Only" is acceptable.