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DUCT LEAKAGE TESTING

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Duct Leakage Testing, Basic Procedure

The basic idea behind using a duct leakage tester to test for duct leakage is:

    1. Use a calibrated fan to pressurize the duct system.
    2. Measure the airflow through the fan with the duct system at pressure.

Just as when you’re testing for air-tightness, each cubic foot of air that leaks out (of the duct system in this case) must be made up by a cubic foot of air blown in by the fan. So, once you’ve measured the amount of air moving through the fan, you’ve quantified the duct leakage at the test pressure.

For duct leakage testing, the standard pressure used is 25 Pascals, which is close to the operating pressure of a typical duct system. This means that when we measure, say, 120 cubic feet per minute of duct leakage at 25 Pascals (written 120 cfm25), that number is a pretty good estimate of how much air leaks out of the duct system while it’s operating.

IT’S MANDATORY to pass inspection for the International Energy Conservation Code (IECC) leakage standards for newly installed HVAC Systems. This inspection needs to be passed to receive a Certificate of Occupancy (CO).

NJ Air Quality has the certification to performs the test for IECC compliance.

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