The final air test must be maintained for at least how many minutes?

The final air test must be maintained for at least how many minutes?

• A. 15 minutes
• B. 30 minutes
• C. 45 minutes
• D. 60 minutes

Answer: (A)

During the final air test, the installed piping is pressurized and the pressure is held steady to see if any leaks show up. Holding the test for at least 15 minutes gives enough time for small leaks to reveal themselves as a drop in pressure, rather than mistaking a short fluctuation for a leak. This minimum duration is what the codes specify to ensure you’ve truly checked the system’s integrity before moving on. Shorter tests could miss slow leaks, while longer tests aren’t required as a minimum and would just extend the process. So the minimum time you must maintain the final air test is 15 minutes.

During the final air test, the installed piping is pressurized and the pressure is held steady to see if any leaks show up. Holding the test for at least 15 minutes gives enough time for small leaks to reveal themselves as a drop in pressure, rather than mistaking a short fluctuation for a leak. This minimum duration is what the codes specify to ensure you’ve truly checked the system’s integrity before moving on. Shorter tests could miss slow leaks, while longer tests aren’t required as a minimum and would just extend the process. So the minimum time you must maintain the final air test is 15 minutes.