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Total duct leakage test.
Duct leakage test report.
Ducts shall be pressure tested to determine air leakage by either of the following.
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Verification can take place via either a post construction test or a rough in test for the post construction test leakage measurement must be made across the entire system including the manufacturer s air handler enclosure with all register boots taped or sealed at a test pressure of 0 1 inches w g.
Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow.
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25 pa across the system including manufacturer s air handler enclosure all registers taped or otherwise sealed post construction test.
A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating ventilating and air conditioning hvac ductwork.
A suggested method is as follows.
The total duct leakage test measures how much air leakage there is for all of the ductwork connected to the hvac system including ducts located both.
Total leakage measured with a pressure differential of 0 1 inch w g.
The only other thing you need to make sure you do is keep the spaces where the ducts are at the same pressure as the outdoors as much as you can anyway.
In the previous page on the basic duct leakage testing procedure we said that you pressurize the duct system and measure the airflow through the fan.
Figure 5 1l from the 2012 smacna hvac air duct leakage test manual shows the allowable leakage as a function of duct leakage classification and static pressure in the duct.
Us duct leakage testing ri trequirements smacna duct class 1 2 inwg 3 inwg 4 6 10 inwg seal class cb a sli t transverse joints seams sealing applicable ransverse joints only asvese joints and seams jo s sea s and all wall penetrations leakage class c l cfm leakage per 100 ft2 1 in h 2 o rectangular.
To find the total duct leakage that s basically all you do.
Total leakage measured with a pressure differential of 0 1 inch w g.
However when a total allowable leakage is expressed as a percent of total flow it is somewhat more cumbersome to prorate the allowable leakage to any single test segment.
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