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Chapter 4 Pressure/Flow @ 50 and @ 25 Modes
Chapter 4 Pressure/Flow @ 50 and @ 25 Modes
4.1 Mode Summary
Mode Application Channel A Display Channel B Display
Pressure/Flow @ 50 Pa
(PR/ FL @50)
Specialized mode for
one-point Blower
Door building
airtightness test. Building pressure in Pascals. Building leakage at 50 Pascals in units
chosen (CFM@50, m
3
/h@50, l/s@50,
in
2
@50, cm
2
@50).
Pressure/Flow @ 25 Pa
(PR/ FL @25) Specialized mode for
one-point total
leakage duct
airtightness test. Duct system pressure in Pascals. Total duct leakage at 25 Pa in units
chosen (CFM@25, m
3
/h@25, l/s@25,
in
2
@25, cm
2
@25).
Note: Appendix A contains Quick Guides for using the DG-700 to conduct one-point building and duct system
airtightness tests using the @50 and @25 features.
4.2 Overview of Pressure/Flow @ 50 and @ 25 Modes

4.2.a Pressure/Flow @ 50 Mode:
The Pressure/Flow @ 50 mode is used to conduct a one-point
Blower Door building airtightness test. In this mode, Channel A
is used to measure building pressure while Channel B is used to
display estimated building leakage at a test pressure of 50
Pascals. The leakage estimate shown on
Channel B is
determined by mathematically adjusting the measured air flow
from the selected Blower Door fan using the real-time
Channel A building pressure reading and a Can’t Reach
Pressure factor (see Section 4.8 below).

4.2.b Pressure/Flow @ 25 Mode:
The
Pressure/Flow @ 25 mode is a specialized mode used for
conducting a one-point total leakage duct airtightness test. In this
mode,
Channel A is used to measure duct system pressure while
Channel B is used to display estimated total duct leakage at a
test pressure of 25 Pascals. The leakage estimate shown on
Channel B is determined by mathematically adjusting the
measured air flow from the selected Duct Blaster fan using the real-time Channel A duct system pressure reading
and a Can’t Reach Pressure factor (see Section 4.8 below).
To select the
Pressure/Flow @ 50 or @ 25 modes, press the MODE button until the selected operating
mode shown o n the gauge display is PR/ FL @50 or PR/ FL @25 . When first entering either of these
two modes, the default pressure units on Channel A is Pascals, the default leakage units on Channel B is
CFM @ 50 or 25 , and the default time averaging period is 1 second average .
14
Operating Instructions
for the DG700