Retrotec Multi-Fan Blower Door - Manual (Page 10)

Page 10 of 37
©Retrotec Inc. 2015
2.2.3. Measure Leakage between rooms using pressure neutralization
The procedure below describes how leakage between rooms or apartments is measured by Pressure
Neutralization.
1. Initially, the first Door Fan pressurizes a
room, and its gauge will measure the
flow (or leakage) across all barriers of a
room.
Record the flow, and keep the Door Fan
On for the following steps.
Figure 7: Pressurize the first room to measure flow from the room
2. A second Door Fan pressurizes the
hallway, but now the room gauge will be
measuring the flow (or leakage) across
all its barriers except its wall between
the hallway – since there is no flow
between this wall due to Pressure
Neutralization.
The drop in flow rate (from step 1), on
the room gauge, indicates the flow or
leakage across the room’s wall between
the hallway
Figure 8: Use a second Door Fan to pressurize the hallway
3. The door of an adjacent room is opened
so that it is pressurized as well. Now the
gauge of the originally pressured room
will be measuring the flow (or leakage)
across all its barriers except its wall
between the hallway and its wall to the
other room.
The drop in flow rate (from step 2), on
the room gauge, now indicates the flow
or leakage across the wall between the
two rooms.
Figure 9: Open a door to the adjacent room to determine flow between
the rooms