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.
Duct leakage test results.
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.
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.
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.
In both cases the requirements are the same.
A duct leakage test duct testing can be performed at rough in before drywalling or post construction.
However our local utah code has a carve out allowing 7 cfm per 100 sq ft.
Our duct leakage test results are in.
Duct leakage test report.
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.
Ducts with less than 40 linear feet in unconditioned spaces.
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.
Leakage class can be calculated using equation 3 but needs to be specified if duct air leakage tests are required.
Testing shall be conducted by an approved third party.
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.
Test to as a leakage specifi cation.
The duct blaster is used to quantify the leakage rate of the duct system.
Duct leakage testing 2017 dc energy conservation code 2015 iecc r403 3 3 duct testing mandatory.
Available for pc ios and android.
The test may be performed prior to close in or at final inspection.
A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating ventilating and air conditioning hvac ductwork.
The test results shall be provided to the building official and the homeowner.
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The energy final inspection will not be complete without a passing test result.
