What is a key step in performing a full flow test?

Recording system air and water pressure is essential in performing a full flow test because it helps establish a baseline for the system's operational parameters. This data is crucial for understanding how the system performs under normal conditions, as well as during an emergency activation. By documenting the air and water pressure, you can identify any deficiencies or issues with the sprinkler system, ensuring that it operates effectively when needed.

This step also serves as a reference point for future tests, allowing for comparability over time. If adjustments or maintenance are performed on the system, having a recorded baseline can help in assessing whether those changes have improved or adversely affected the sprinkler system's performance.