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©Retrotec 2017
31. Record duct leakage, “Flow” on the gauge, when you’re confident the building and duct pressures
have both been stabilized at -25Pa.
For pressurization, set the Blower Door to blow into the building and the DucTester to blow into the
duct system. If your standard requires 50 Pa, substitute 50 for 25.
Figure 35: 1 Gauge Duct Leakage to Outdoors under pressurization, setting the building pressure
32. Ensure that the Device is 340 and the correct DucTester Range is selected on the gauge.
Figure 34: Disconnecting and re-connecting the blue
pressure tube is easier using a male-to-male connector
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