What percentage of cylinder capacity triggers the SCBA low pressure alarm?

The low-pressure alarm for self-contained breathing apparatus (SCBA) is typically designed to activate when the cylinder pressure drops to a critical level, which ensures that users are alerted in time to exit hazardous environments safely. The correct answer reflects standard thresholds that are widely recognized in firefighting practices. Generally, the low-pressure alarm is set to activate when the air supply in the SCBA cylinder reaches approximately 20-25% of its full capacity. This range allows sufficient time for the firefighter to complete their tasks safely and begin a controlled exit from the hazardous area. Recognizing this percentage is vital for safety protocols and ensures that personnel are prepared for potential emergencies, making it an essential aspect of fire safety training.