Retrotec Commercial 441 and 451 DucTester - Manual (Page 51)

Page 51 of 56
©Retrotec Inc. 2015
Step 2 – Prepare the ducts
□ Determine the Pressure Class Use specified value. If not specified, use a
Pressure Class of 1 in WC except upstream of VAV
boxes, use 2 in WC. Use a positive test pressure
unless specified otherwise. Test pressure shall not
exceed the Pressure Class according to SMACNA
“HVAC Air Duct Leakage Test Manual”.
□ Measure duct area
□ – But not if using %
airhandler flow as pass/fail
criteria.
Select a limited section of duct for which the
estimated leakage will not exceed the capacity of
the test apparatus. Measure the duct surface area
in square feet. See Table 11 and Table 12.
□ Ensure sealing is complete Ensure sealing materials have cured for the
prescribed time or at least 24 hours OR follow
manufacturer’s directions.
□ Blank off ductwork Blank off and seal the tested ductwork by
inserting temporary plugs plates, sheets, balloons,
bags into intentional openings.
Step 3 – Connect DucTester to ducts
□ Attach 4 inch Flange to
ductwork.
□ Attach 4 inch collar on flex to
flange
□ Connect DucTester exhaust
to flex
□ Install Range 47 Flow Plug Range 47 provides 52 to 206 CFM, which is
sufficient to test most duct runs.
Step 4 –DucTester tubing, control and power connections
□ Connect yellow and green
tubes between DucTester
and gauge
□ Connect blue tube to gauge
and to ducts using static
probe or connection on
flange
□ Plug in the Speed Control
Cable between DucTester
and Gauge
□ Plug in to power source