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Airflow Test
All tests were performed on a hermetically sealed test
model, according to the specifications of the test
equipment. Each vent was mounted over a 91” long
by 2” wide exhaust slot on the ridge of the roof
model, and sealed top and bottom (closed cell foam
strip) so the airflow measured was through the ventilation
openings in each test vent.
The
Duct Blaster test components meet the flow calibration
specifications of both the CGSB Standard 149.10-M86
and ASTM Standard E779-87. The Minneapolis Duct Blaster
has a fan flow accuracy of +/- 3 percent using the
Energy Conservatory Digital Manometer (DG-3).
Note: The 5 pascal pressure utilized was chosen because it
is one of the smallest units of pressure that
is commonly used for airflow / pressure measurements.
As an example, 5 Pascals = 0.0014765 inches of mercury,
or 0.000725 pounds per square inch of air pressure.
This is similar to the low wind speed and pressure
typically found in an attic roof cavity on a calm day.
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Note: these tests,
measurements, and calculations were performed using the Energy
Conservatory Minneapolis Duct Blaster (Series B) fan assembly,
in conjunction with the Minneapolis pressure and fan flow gauge
(Digital Manometer Model DG-3).
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