When donning SCBA, what is the minimum percentage of air capacity that should be in the cylinder?

When donning a Self-Contained Breathing Apparatus (SCBA), it is essential to have a sufficient air supply to ensure safety during firefighting operations. The correct choice indicates that the minimum percentage of air capacity that should be in the cylinder is 90%. This ensures that firefighters have an adequate reserve of air for operations and potential emergencies that may require more breathing time than initially anticipated.

Having at least 90% of air capacity allows for extended use of the SCBA while also accounting for any potential delays in returning to the safety of fresh air. This practice reinforces the principle of risk management in firefighting, prioritizing safety by ensuring that personnel have enough air in the event they face unforeseen circumstances, such as becoming trapped or needing to evacuate. It is a standard that aligns with safety guidelines and best practices within firefighting protocols.