Retrotec Multi-Fan Blower Door - Manual (Page 8)

Page 8 of 37
©Retrotec Inc. 2015
2. Large Building Leakage tests
There are two basic types of tests: Total Zone Leakage and Zone-to-Zone Leakage.
Total Zone Leakage is any test where the objective is to measure the total leakage of an enclosed
volume. This enclosed volume could be anything from a one bedroom apartment to a commercial office
building.
Zone-to-Zone Leakage is any test where the objective is to measure the leakage of one zone into
another zone. This includes a wide variety of measurements, such as the leakage from one floor to
another, the leakage between two neighboring apartments, or the leakage from a house into an attic
space.
Although the setup of the Door Fan systems is the same for both types of leakage tests, the actual test
procedures for measuring leakage between multiple zones is different than that for measuring the total
leakage of one zone.
2.1 Total Zone Leakage Test
In a Total Zone Leakage test, the entire zone is pressurized (or depressurized) to a uniform pressure and
the leakage measured is the Total Zone Leakage.
In Figure 4, the Door Fans are pressurizing one zone, so they are measuring the total leakage of the
entire zone or building.
Figure 4: Buildings pressurized as a single zone to measure Total Zone Leakage