Retrotec Blower Door with DM-2 - Manual (Page 4)

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Perform a Blower Door test on the building and
record the EqLA at 50 Pa.
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Install cardboard in upper part of doorway with a
20 x 20 inch hole cut in it.
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Perform a second Blower Door test on the
building, record the EqLA at 50 Pa.
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Subtract the first result from the second result
and the value should be 400 sq. in. (+/-10%).
QuickGuide Blower Door
Speed control is handled automatically with FanTestic
software, for complete automation.
Control Fan speed with software Field system check monthly
Alternatively, use a Verification Plate in an optional
double hole Door Panel, or use the optional Flex Duct
with a 400 sq. in. hole in a plate on the end.
Page 4 of 4
Check gauge operation and check for blocked, leaking
or pinched tubes weekly, and anytime results are in
question.
To perform the gauge check, you will need the gauge
and Umbilical.
□
Press [Exit] [Time Average] until “4s” appears.
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Press [Mode] repeatedly to display “PrB”.
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Connect the yellow tube between the red and
yellow ports.
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Repeat between different ports with each of the
tubes you use for testing.
Field check gauge weekly
If readings on “PrA” and “PrB” are within 2% and
don’t drop rapidly, the tube is not blocked or
leaking and the gauge is correct.
Checking your gauge
and tubes regularly will
eliminate a common
source of error in
readings.