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©Retrotec 2017
19. Connect the Blower Door per diagram in Figure 30 (depressurization) or Figure 31 (pressurization).
20. With DucTester fan off, set the Blower Door to 25 Pa by pressing [Set Pressure] [25] [Enter] on
the Blower Door gauge.
Figure 30: Method #2: Duct Leakage to Outdoors, under depressurization
21. Press [@] if required to remove extrapolation; “@ is Off” should then be displayed on the DucTester
gauge.
22. Set the DucTester to 0 Pa by pressing [Set Pressure] [0] [Set] on DucTester gauge.
23. When 0 Pa +/– 1 is achieved on the DucTester gauge, record “Flow” from the DucTester gauge, which
is Duct Leakage to Outdoors.
Figure 31: Method #2 Duct Leakage to Outdoors, under pressurization
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