Retrotec DucTester 200 Series Residential Applications - Manual (Page 50)

Page 50 of 91
©Retrotec Inc. 2015
“Open,” “Mid,” or “Low” (200 series fan); "Open”:
To clear the test data shown in this section, click the “Clear Test Data” button.
7.7.3. Convert “Flow/Area” data so it can be entered into spreadsheet
Before obtaining the Duct Leakage Test Reporting software, you may have previously only recorded the
“Flow/Area” data directly from your gauge, but no “Flow” data. Now you might like to print a report
based on this Flow/Area. You will soon realize that you cannot enter Flow/Area data directly into the
software to obtain results. Instead, you must enter “Flow” to calculate results; therefore, you must
calculate a “Flow” to enter.
Example:
You live in North Carolina, and your state code requires that you report your results in the units of
CFM/100 sq ft. During a prior test of your client’s duct system, you measured and recorded a Flow/Area
of 26.3 CFM/100 sq ft at 25.0 Pa on your gauge. The conditioned flow area of the house is 1500 sq ft.
What do you enter into the software as your “Flow”?
Flow =
Flow
Area
∗ conditioned floor area
Flow =
26.3 CFM
100 sq ft
∗ 1500 sq ft
Flow = 395 CFM
You would enter a “Flow” of 395 CFM, at a “Duct Pressure” of 25 Pa, with a “Conditioned Floor Area” of
1500 sq ft into the software.
7.8 Spreadsheet will calculate Cost of Duct Leakage
Values for parameters can be entered into the “Cost of Duct Leakage” section so that estimates of the
Annual Cooling Loss and Annual Heating Loss (i.e., potential energy losses due to duct leakage) can be
reported. These inputs are optional. If nothing is entered into this section, the “Cost of Duct Leakage”
section of the report will not appear in the output.