What airflow amount must not be exceeded while performing a leakage test using the Air Flow Method (AFM)?

What airflow amount must not be exceeded while performing a leakage test using the Air Flow Method (AFM)?

• A. 60 CFM
• B. 30 CFM
• C. 90 CFM
• D. 120 CFM

Answer: (A)

In an Air Flow Method leakage test, you conduct the test with a controlled, relatively small airflow so the pressure balance and meter readings stay accurate. The standard specifies not to exceed 60 CFM for this test. Keeping the airflow at or below this limit ensures the measurement reflects actual leakage rather than being distorted by excessive flow, turbulence, or pressure changes that could compromise the test results and safety. Exceeding 60 CFM would push the test outside its calibrated range and produce invalid readings. The other options either stay below the limit (still permissible) or exceed it (not allowed).

In an Air Flow Method leakage test, you conduct the test with a controlled, relatively small airflow so the pressure balance and meter readings stay accurate. The standard specifies not to exceed 60 CFM for this test. Keeping the airflow at or below this limit ensures the measurement reflects actual leakage rather than being distorted by excessive flow, turbulence, or pressure changes that could compromise the test results and safety. Exceeding 60 CFM would push the test outside its calibrated range and produce invalid readings. The other options either stay below the limit (still permissible) or exceed it (not allowed).