What is the correct sequence for using a self-contained breathing apparatus (SCBA)?

The correct sequence for using a self-contained breathing apparatus (SCBA) emphasizes safety and readiness before entering any hazardous environment. The first step is to inspect the SCBA to ensure that all components are operational and that there are no damages. This crucial first step helps identify any potential issues that could compromise the user's safety during operation.

After inspecting the SCBA, donning the mask and harness follows next. This step is vital as it ensures that the user is properly equipped for the task at hand. After the mask and harness are secured, conducting a function check is imperative to confirm that the breathing apparatus is working correctly and that airflow is adequate. Finally, ensuring a proper seal is essential as it prevents contaminants from entering the mask, providing the necessary protection against hazardous environments.

This sequence prioritizes the safety and effectiveness of the SCBA use, minimizing risks associated with entering environments that may be potentially dangerous or life-threatening.