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correct, and that the ducts are not leaky, is to unseal a single register. This introduces a leak to the duct
system, which is measured by the equipment. If this test results in a measure leak of the approximate
size of the opened register, the previous test is valid, and the system is too tight to measure any duct
leakage.
• Method 2 duct leakage to outdoors or combined method has erratic readings:
Huge errors will result if the @ Pressure function is turned on during this test because it creates a divide
by zero error. Press [@] to remove “@” from under the result. This method relies on the DucTester
gauge measuring the pressure between the house and ducts which is set to zero by the DucTester but
the extrapolation to zero that is attempted by the gauge will not work.
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