Other methods – Retrotec DucTester 200 Series Residential Applications User Manual
Page 58
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©Retrotec Inc. 2015
the Open Range. Set the pressure to the just measured supply plenum pressure. Press
[Set Pressure]
and enter the previously measured supply plenum pressure. Read the CFM result directly from the
gauge after waiting for at least one minute to let the measurement settle down.
For example, if the pressure in the supply plenum is 70 Pa, press
[Set Pressure]
,
[70]
,
[Enter]
to get the
Blower Door to recreate the original pressure in the plenum. Read the CFM result directly from the
gauge
If “TOO LOW” or “----“appears the pressure in the plenum is too high to get an accurate reading. Repeat
the procedure but move the Static Pressure Probe to measure the pressure farther away from the air
handler.
9.9 Other methods
Temperature rise and other standard HVAC methods exist but are not covered here.