What should be the priority during donning procedures in a contaminated environment?

During donning procedures in a contaminated environment, ensuring that the blower and mask are correctly fitted and functioning is crucial as they provide the first line of defense against inhaling hazardous substances. The blower helps to maintain positive pressure and ensures that contaminated air is not drawn into the mask, which is vital for the safety of the user. This combination is essential for protecting the respiratory system and ensuring adequate air supply under high-stress conditions.

Once the blower and mask are secure, the other components like the suit, gloves, and communication gear can be put on, but prioritizing the mask and blower first establishes a critical respiratory protection baseline. In a contaminated environment, immediate protection of the airways takes precedence over other equipment that may be important but does not offer direct breathing safety.