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Duct Leak Test

Duct Leak Test

A duct leak test is a diagnostic procedure used to measure the air tightness of a building’s ductwork. It helps identify and quantify air loss that can reduce system efficiency and affect indoor air quality. During the test, all supply and return registers are temporarily sealed, and a calibrated fan is connected to pressurize or depressurize the duct system. A pressure-measuring device then records the airflow needed to maintain the set pressure, allowing technicians to calculate the leakage rate. The results are compared against standard limits to pinpoint areas requiring repair, such as leaks at joints, seams, or connections.

Why It's Performed