The vacuum test requires a reading at the end of 5 minutes during which no more than how many inches of vacuum should be lost?

In the context of a vacuum test, the standard measurement is critical in assessing the integrity of the vacuum system. A loss of no more than 10 inches of mercury vacuum during the testing period indicates that the system is maintaining adequate performance and is not leaking excessively.

If the vacuum system can sustain this level, it demonstrates that the equipment is functioning correctly and that there are no significant issues that would compromise its operation. This loss threshold reflects industry standards that ensure operational reliability and safety in fire service vehicles.

Higher losses, such as 15 or 20 inches of vacuum, would suggest potential problems, such as leaks or failures in the vacuum system, which would necessitate further inspection or maintenance. Therefore, maintaining the loss to within 10 inches during the five-minute test is crucial for the effective performance of the vacuum system in fire service vehicles.