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.
Duct leakage test report.
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The purpose of duct leakage testing is to evaluate how well a home s duct system can hold air.
Test apparatustest apparatus duct leakage test system consists of duct leakage test system consists of.
However the blower for the test apparatus would have to produce 24 cfm at 10 to 12 static.
Both the 2009 and 2012 iecc require duct tightness to be verified.
1 blower with speed control vfd to generate range of pressure flowrange of pressure flow 2 flow measuring devices flow grid flow station high flow flow grid flow station high flow orifice plate low flow.
Duct leakage testing wikipedia the free encyclopedia a duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air.
Duct leakage testing has become a requirement in many jurisdictions and counties throughout colorado.
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Another form of duct leakage to outside uses a blower door to measure the total amount of leakage of the house then seal off all registers and returns.
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.
The idea behind it is that the more air that leaks out of the duct system the more potential energy loss can occur.
Verification can take place via either a post construction test or a rough in test.
If different from above street.
Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
If the test is at 6 static pressure for leakage class 3 compliance i e 9 6 cfm per 100 s f with 6 orifice differential and 6 duct test pressure the meter could only indicate 24 cfm.
