NFPA-99 requires that the Medical Gas Manifold room door have proper warning signs depending on what gases will be stored in the room. If there is Nitrous Oxide, Nitrogen or Carbon Dioxide in the room, the sign must say the room may have insufficient oxygen and to open the door and allow room to ventilate before opening.
We also offer a smaller sign with the same verbiage. Ideal for dental offices. Signs measure 6" x 4"