2
USING THE DG-700 WITH THE MINNEAPOLIS BLOWER DOOR
Before the Test
• Install the blower door frame, panel and fan into an exterior doorway. For instructions about how to do this, please see
Chapter 2 of the Minneapolis Blower Door User Manual.
• Prepare the building for the blower door test. For instructions about how to do this, please see
Chapter 3 of the Minneapolis Blower Door Manual.
Tube Hookup
1. Attach one end of the green tube to the Channel A reference tap. Run the other end of the
tubing outside through one of the holes provided in the lower corner of the nylon panel.
2. Attach one end of the red tube to the Channel B input tap. Attach the other end of the red
tube to the pressure tap on the blower door fan.
Note: For help with how to connect the tubing to the DG-700, please use the Tubing Assistant
on our website.
Conducting the Test
CONDUCTING A ONE-POINT DEPRESSURIZATION TEST
1. Turn on the DG-700 and place it in the proper mode
Turn on the gauge and press the MODE button twice to put the gauge into the PR/ FL @50 mode. In this specialized test
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 (CFM50). The leakage estimate shown on Channel B is determined by mathematically adjusting the
actual air ow from the blower door fan to a test pressure of 50 Pascals, using the real-time Channel A building pressure
reading and a Can’t Reach 50 factor, which can be found in the Blower Door Manual on page 9.
2. Measure the baseline building pressure
When conducting a blower door test, we want to measure the change in building pressure caused by air owing through the
blower door fan. In order to measure this change accurately, we need to account for any existing pressures on the building
caused by stack, wind and other driving forces. This existing building pressure is called the “baseline building pressure.”
The DG-700 has a built-in baseline measurement procedure which allows the user to quickly measure and record the baseline
pressure on Channel A, and then display the baseline adjusted pressure. This feature makes it possible to “zero out” the
baseline building pressure on Channel A, and display the actual change in building pressure caused by the blower door fan.
With the fan sealed off, begin a baseline building pressure reading from Channel A by pressing the BASELINE button. The
word “BASELINE” will begin to ash in the Channel A display indicating that the baseline feature has been initiated. Press
START to start the baseline measurement. During a baseline measurement, Channel A will display a long-term average
baseline pressure reading while Channel B is used as a timer in seconds to show the elapsed measurement time. When
you are satised with the baseline measurement, press the ENTER button to accept and enter the baseline reading into the
gauge. The Channel A display will now show an ADJ icon to indicate that it is displaying a baseline adjusted building pressure
value. Note: Once a baseline measurement has been taken and entered into the gauge (i.e. ADJ appears below the Channel A
reading), a new baseline measurement procedure can be initiated by pressing the BASELINE button.
