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Duct leakage test report.
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.
Required 3rd party test for new homes and retrofits according to building codes in the state of illinois a duct pressure test must be performed if any portion of the hvac system is placed in unconditioned spaces such as an attic crawlspace or garage.
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.
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.
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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A duct leakage test duct testing can be performed at rough in before drywalling or post construction.
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 testing 2017 dc energy conservation code 2015 iecc r403 3 3 duct testing mandatory.
Test to as a leakage specifi cation.
However our local utah code has a carve out allowing 7 cfm per 100 sq ft.
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Irc 2015 n1103 3 4 allows the following duct leakage.
Testing shall be conducted by an approved third party.
The test results shall be provided to the building official and the homeowner.
The energy final inspection will not be complete without a passing test result.
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.
Ducts with less than 40 linear feet in unconditioned spaces.
In both cases the requirements are the same.
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Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
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 duct blaster is used to quantify the leakage rate of the duct system.
