When does the SCBA EOSTI sound, according to current NFPA standards?

According to current NFPA standards, the SCBA (Self-Contained Breathing Apparatus) End of Service Time Indicator (EOSTI) is designed to sound an alarm at 35 percent of the cylinder's capacity. This serves as a critical safety feature, alerting firefighters to the need to exit hazardous environments before the air supply is depleted to a level that could compromise their safety.

The EOSTI allows firefighters to maintain situational awareness regarding their air supply while engaged in operations, as they can often become immersed in their tasks and lose track of their air consumption. Setting the alarm at 35 percent helps ensure that there is enough air remaining to facilitate a safe egress from a potentially dangerous situation, thereby enhancing overall operational safety.