What is the recommended air quality for filling SCBA cylinders?

The recommended air quality for filling SCBA cylinders is one that is free from contaminants and has specific moisture content, which includes a dew point of -50°F. This standard ensures that the air supplied to the SCBA is safe for the user and minimizes risks associated with breathing in harmful substances or moisture that could lead to equipment malfunction.

Having a dew point of -50°F indicates that the air is extremely dry, which is crucial because moisture can lead to condensation inside the cylinder and potentially compromise the integrity of the air supply. Contaminated air or air with insufficient oxygen content would pose serious health risks to users. Therefore, the requirement for clean, dry air helps maintain proper airflow and safety while using the SCBA in hazardous environments.