The duct blaster test is similar to the blower door test in that it uses a calibrated fan to pressurize (or depressurize) and measure the air flow that it takes to keep the system at that pressure. The fan used for the duct blaster is very sensitive and capable of measuring very small to very large leakage air flows.
During the duct blaster test, the HVAC system is sealed off from the rest of the house using blocks or temporary sealing tape and the cumulative effects of all the leakage from all gaps and cracks is measured. The test can also be completed in conjunction with the blower door test to isolate the leakage just to outside the building envelope or without the blower door to measure total duct leakage.
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