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.
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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.
Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in rs 33.
In both cases the requirements are the same.
However our local utah code has a carve out allowing 7 cfm per 100 sq ft.
A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating ventilating and air conditioning hvac ductwork.
Duct leakage test report.
A duct leakage test duct testing can be performed at rough in before drywalling or post construction.
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Ducts with less than 40 linear feet in unconditioned spaces.
The system will need to achieve a leakage rate of less than 4 cfm cubic feet per minute per 100 square feet of the home.
The test results shall be provided to the building official and the homeowner.
Here is an example.
The test may be performed prior to close in or at final inspection.
Duct leakage testing 2017 dc energy conservation code 2015 iecc r403 3 3 duct testing mandatory.
The duct blaster is used to quantify the leakage rate of the duct system.
The energy final inspection will not be complete without a passing test result.
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Rough in test less than 4 cfm per 100 sq ft which for my house is about 160 cfm if the air handler is included in the leakage test.
Mcgill airflow often gets specifi cations stating that the leakage class for rectangular and round ductwork will be in accor dance with the smacna table 4 1 for a 3 inch water gauge wg supply duct system thus allowing the rectangular duct leakage class to be 12 and the round and fl at oval duct leakage.
Irc 2015 n1103 3 4 allows the following duct leakage.
Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
