For which compressed gases are permits required, and in what amounts?

The correct choice highlights that permits are required for certain gases at specified quantities, focusing on the thresholds at which regulation is necessary for safe handling. In this context, carbon dioxide is cited with a limit of 4500 cubic feet, indicating the volume at which precautions and permits must be enforced due to the potential hazards associated with its use. Non-flammable gases also have a specified limit of 3000 cubic feet, reflecting industry standards for managing these gases safely.

Understanding the regulations for permits is essential in the context of facility management and safety protocols, as it ensures that staff are trained and equipped to handle these materials responsibly. Non-flammable gases, while not reactive, can still pose risks if not properly monitored or contained, warranting specific guidelines and permission for their use and storage.

In the context of the other options, it is important to note that they either cite incorrect volumes for gases or mention gases that do not fall within the standard regulatory framework for permits. Recognizing the correct criteria for permit requirements is vital for compliance and operational safety in medical environments.