Retrotec DucTester with DM-2 - Manual (Page 6)

Page 6 of 8
To measure the air leakage from the
duct system to outdoors requires both a
DucTester and a Blower Door system.
The Blower Door depressurizes the house
and the DucTester depressurizes the
ducts so leakage from the duct system
back into the conditioned space of the
home is neutralized.
Method #1:
Method #2:
□
Connect the red T-connected tubes to red ports
per diagram.
□
Press [Set Pressure] [25] [Enter] on DucTester
gauge then on Blower Door gauge.
□
Press [@ Pressure] on DucTester gauge to display
the results “@25Pa”.
□
When “25 Pa” +/– 1 is achieved on both gauges,
record duct leakage to outdoors from the DucTester
gauge.
□
Connect tubes to gauges per diagram.
□
With DucTester off, set the Blower Door gauge
to -25 Pa by pressing
[Set Pressure] [25] [Enter].
□
Press [@ Pressure] on DucTester to remove
“@25Pa” from the display.
□
Set the DucTester to “0 Pa” by pressing
[Set Pressure] [0] [Enter]. When “0 Pa” +/– 1
is achieved, record duct leakage to outdoors
from the DucTester gauge.
Method 1 uses the DucTester set up the
same way as for the Total Duct Leakage
test, and allows use of [@ Pressure] to
increase accuracy.
Results are easier to visualize since both
the duct and house pressure can be seen.
Method 2 does not require connecting
a red tube to the DucTester gauge but
results in large errors if [@ Pressure] is
turned on.
Set DucTester gauge to 0 Pa,
Blower Door gauge to -25 Pa **
Set both gauges to -25 Pa **
Blower Door gauge DucTester gauge
Optional Test
Duct Leakage to Outdoors: Depressurize
Options
** If 50 Pa test pressure required, use 50 in all instructions.
Method# 1