Both accelerators and exhausters are activated when a drop of _______ PSI is detected in the system.

The correct answer is based on the typical pressure drop threshold used in sprinkler systems to ensure optimal performance and safety. When a drop of 2 PSI is detected in the system, it serves as a trigger for both accelerators and exhausters to activate. This threshold is critical because it indicates that there may be an issue with water flow, which could compromise the functioning of the sprinkler system.

By activating at a 2 PSI drop, the system can respond promptly, either by increasing pressure to maintain functionality or by ensuring that any potential malfunctions or leaks are addressed swiftly. Setting the activation point at 2 PSI strikes a balance between being sensitive enough to detect issues and avoiding unnecessary activations for minor fluctuations that could occur under normal operation. This helps maintain the integrity and reliability of the sprinkler system, ultimately enhancing fire safety measures within the environment it protects.