□
Connect Flex Duct to fan
exhaust
.
□
Check that tubing is connected the same as for
depressurize test (step 3).
□
Conduct test (step 4).
Duct Leakage to Outdoors:
Pressurize
Follow depressurize test method (page 6) except both
fan directions are reversed.
Page 7 of 8
Total Duct Leakage: Pressurize
Optional Test
Pressurizing can blow the Grill Mask off the registers!
Options
pressurize
Inlet
airflow
Exhaust
□
Pass the Flange through the 10 inch hole in the
Flow Hood and tape it inside.
□
Attach the Flex Duct.
□
Secure the Flow Hood over the register
To measure Duct leakage:
□
Connect the Flex Duct to the fan and test as usual.
To measure HVAC System Flow:
□
For measuring supply flows, attach the Flex Duct
to the inlet (suction) side of the fan.
□
For measuring return flows, attach the Flex Duct
to the exhaust (discharge) side of the fan.
□
Connect the umbilical to the DucTester.
□
Attach the blue tube to the Flow Hood and gauge.
□
Press
[@ Pressure]
until “@” is removed from
display
□
Press
[Mode]
to select “Flow”
When a definite pressure appears on “PrA”:
□
Adjust the speed until “PrA” reads a pressure of 0 Pa.
Or
□
Press
[Set Pressure] [0]
to have the DucTester
automatically achieve a 0 pressure.
□
Read the HVAC system flow result directly from
the gauge
Using the optional Flow Hood
Connect it quickly to ceiling level returns to measure
duct leakage or use it with your DucTester as a Pow-
ered Flow Hood to accurately measure HVAC system
flow rates.
Flow Hood
blue tube
